10 Trailer Stabilizer Jacks That Prevent Long Term Sinking

When you park your trailer for months at a time, the ground shifts, moisture creeps in, and cheap stabilizers start to sag. You need gear that holds firm season after season, not just for a weekend trip.

This guide breaks down ten stabilizer jacks and pads built for the long haul—from heavy-duty scissor sets to stackable blocks—so you can pick the right support for your setup and storage conditions.

MaxxHaul Swing Down Stabilizers – Rust Resistant Pair

The MaxxHaul 50970 set gives you two telescoping stabilizers with an 18-inch extended height and 12-inch collapsed height, each rated for 1,000 pounds of static load. That’s enough to keep a small trailer level during long term storage without stressing the frame.

The black electrophoretic paint coating is the standout feature here—it’s designed to resist rust and corrosion even when your trailer sits in damp grass or near salt air. Pre-drilled holes make mounting straightforward, though you’ll need to supply your own hardware.

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• Sturdy Support: Each stabilizer jack boasts an extended height of 18" and a collapsed height of 12", offering reliable stability to keep your trailer level. With a static load capacity of 1000 lbs and a lift capacity of 650 lbs, it's the perfect solution for maintaining balance on the road.
• Rust-Resistant Design: Coated with black environmentally friendly electrophoretic paint, these stabilizer jacks are built to withstand the elements without succumbing to rust or corrosion, ensuring long-lasting performance.
• Complete Package: This set includes 2 stabilizer jacks and 1 handle, providing everything you need for hassle-free installation and operation.
• Easy Installation: While mounting hardware is not included, the jacks feature pre-drilled mounting holes for quick and convenient setup. Simply use four 3/8" bolts (not included) to secure them in place. For added security, consider using a 1/4" spacer between the frame and mounting surface to ensure a snug fit.

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ROBLOCK 6-Inch Jack Block – Stackable Polymer Support

The ROBLOCK 6-inch trailer jack block is built from high-performance polymer with anti-UV additives, so it won’t crack or degrade when left in the sun for months. Its stackable design lets you adjust height easily, which is handy when your storage spot has uneven ground.

This block supports nearly any jack foot—tongue jacks, scissor stabilizers, and even 5th wheel hydraulic feet. The side hole and rope make it simple to carry, and the one-piece structure means no parts to lose or break over time.

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• Sturdy & Robust: Our RV trailer jack blocks are built with a high-performance polymer and added anti-UV aging additives to resist dirt, grime and oil for years of rugged use. G.V.W 40000 Lbs per block
• Widely Used: The trailer jack block supports nearly any tongue jack foot, wheel jacks, 9” round 5th wheels hydraulic jack foot or Scissor Stabilizer and more! ELIMINATES NEARLY ALL MOVEMENT AND SWAY in parked RV's and Trailers
• Adjustable Height: Each RV jack block features a stackable design, allowing you to easily adjust the height according to your needs. This flexibility ensures that you can achieve the perfect leveling for your camper, even on uneven surfaces
• Easy to Carry & Store: The hole on the side of the block and the rope are easy to carry, with storage bag is convenient to store and saving space
• Size & Service: About 6" tall, L:11.5", W:11.5". If you have any questions after purchase, please contact us at first, we will glad to help you solve the problem

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LIBRA 9K HD Scissor Jacks – Heavy Duty 4-Pack

The LIBRA 9K HD set includes four scissor jacks made from thick 11-gauge steel, each capable of supporting up to 9,000 pounds. That’s serious strength for a travel trailer or camper parked for the winter, and the electrophoresis coating adds a layer of corrosion protection.

You get a 3/4-inch hex magnetic socket for power-drill operation, plus 16 mounting screws, a 9/16-inch socket, an 11/36-inch drill bit, and a drilling guide sticker. Everything you need is in the box, so installation is quick even if you’re not handy.

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• 【True Heavy-Duty 9,000 lbs Capacity】 Made from thick 11-gauge steel for maximum strength heavy-duty steel with electrophoresis coating for long-lasting durability. One of the strongest RV stabilizer jacks on the market, built to last and safely handle heavy trailers.
• 【Complete 4-Pack with Power-Drill Ready Socket】 Includes 4 steel jacks and a 3/4" hex magnetic socket for fast power-drill operation. Set up your RV quickly and effortlessly.
• 【All Installation Hardware Included】 Comes with 16 pcs 3/8" mounting screws, matching 9/16" socket, 11/36" drill bit, and a drilling guide sticker — everything you need for fast and precise installation.
• 【Adjustable Height for Versatile Fit】 Extended height: 24", retracted height: 5", retracted length: 26", width: 7.5". Designed to stabilize and level a wide range of RVs, campers, and trailers.
• 【Safe & Easy Operation】 For stabilizing and leveling only. Never use for lifting, changing tires, or supporting vehicle weight. Smooth scissor mechanism ensures effortless raising and lowering, even for first-time users.

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VEVOR Slide Out Support Jacks – Adjustable 20-48 Inches

If your RV has a slide-out, the VEVOR support jacks are a game-changer for long term storage. Each jack is made from 2mm thick steel pipes and supports up to 5,000 pounds, with an adjustable height range from 20 to 48 inches to match different ground clearances.

The folding handle lets you raise the bracket slowly and precisely, so you can fine-tune the support without straining. Built from Q235A steel with a robust spray finish, these jacks are designed to withstand years of outdoor exposure without weakening.

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• Sturdy Support: Get reliable stability with our RV slide out support 2-pack. Constructed with 0.08''/2mm thick steel pipes, each stabilizer can support a maximum weight of up to 5000 lbs/2.27 ton. The slide out support ensures your RV stays firmly in place, preventing sliding or sagging and keeping your vehicle stable and secure during your activities inside.
• Easy Adjustment: Adjusting the RV slide out stabilizer jack is a breeze. From the lowest setting, use the folding handle to raise the bracket slowly to meet the RV slide out supports bars. Effortless operation ensures a hassle-free setup. We recommend using concrete or wooden leveling blocks on grassy surfaces.
• Versatile Compatibility: Our camper slide out support jacks provide an adjustable height range of 20-48"/500-1230 mm, making it suitable for various RVs with different ground clearances. Enjoy the flexibility to adapt to different RV heights effortlessly.
• Built to Last: Crafted with Q235A steel, our slide out stabilizer base undergoes a robust spray-plastic treatment to resist corrosion and rust. The galvanized 20# steel screw handles impact and abrasion, ensuring a long-lasting performance that can withstand the test of time.
• Convenient Storage: Each RV slide out jack has a compact size, weighing only 8.52 lbs/3.865 kg and measuring 20.1×5.3×5.3''/510x135x135 mm. The 2-pack weighs just 17 lbs/7.73 kg, making them lightweight and easy to carry. Store them effortlessly, and enjoy the convenience of compact storage.

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RVMATE Jack Pads – Interlocking Anti-Sink Base

The RVMATE 4-pack of jack pads gives you a 6-3/16-inch square footprint with a honeycomb structure that spreads heavy loads evenly. This prevents your stabilizer jacks from sinking into soft soil, mud, or gravel—a common issue when trailers sit for months.

Each pad has an interlocking design so you can connect multiple pads together for a larger base, and a built-in carry handle makes them easy to move. A free storage strap keeps the set bundled neatly in your compartment.

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• Anti-Sink & Stable Support: Effectively prevents trailer stabilizer jacks from sinking into soft soil, mud, grass, gravel, tree roots and uneven ground. It provides a solid level base to avoid tilting and ensure safe, reliable parking on all rough and soft terrain.
• Large Support Base: Boasting a 6-3/16" × 6-3/16" footprint, these RV jack pads feature a sturdy honeycomb structure to evenly disperse heavy loads and absorb pressure for superior stability.
• Interlocking & Portable Design：Smart interlocking structure allows multiple pads to connect tightly; built-in carry handle makes moving effortless.
• Free Storage Strap Included：Comes with a handy storage strap for easy bundling, neat storage and convenient portability.
• UV Resistant & Durable: Made from heavy-duty UV-stabilized polypropylene, these jack pads stand up to sun exposure and harsh outdoor weathering. Premium material delivers excellent durability for long-term use on RVs, trailers and campers.

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Rigid Hitch Telescoping Jack – Zinc Plated Pair

The Rigid Hitch SJR-208-2PK is a pair of telescoping stabilizer jacks with a 2,000-pound lift capacity and 18 inches of travel. They’re designed for utility trailers, horse trailers, and car haulers, making them a versatile option for various storage scenarios.

Zinc plating provides corrosion resistance, which is crucial for long term outdoor parking. The mounting bracket is 8 inches long and 1.5 inches wide, with a 5.25-inch footplate diameter for stable contact with the ground.

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• Use on utility trailers, horse trailers, car haulers, stock trailers and more.
• 2,000 lbs lift capacity, 18" travel. Zinc plated for corrosion resistance.
• 20 inches overall height, 1-3/16" from center of hole to center of hole, Drop leg width – 1-1/4".
• Mounting bracket dimensions: 8" long x 1-1/2" wide, 5-1/4" footplate diameter.
• Provides rear support to prevent trailer tipping when unloading.

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OULEME 24-Inch Scissor Jacks – 9500 lb Capacity Set

The OULEME scissor jack set delivers a hefty 9,500-pound capacity per jack, with a wide-base construction that enhances stability under load. The height adjusts from 4 to 24 inches, giving you flexibility for different trailer frames and ground levels.

You get a manual crank handle, a 3/4-inch drill socket, 8 mounting screws, and a detailed instruction manual—everything for a straightforward install. The high-tensile steel and zinc-chromate-finished hardware pass salt spray tests, so they’ll hold up in coastal or snowy storage areas.

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• Heavy-Duty Performance: Heavy-duty 9,500 lbs capacity for effortless RV/trailer leveling; wide-base construction delivers enhanced stability under load.
• Wide Adjustment Range: Versatile height adjustment from 4" to 24" to suit various trailer frames. (Retracted: 26"L x 5"W x 4"H; Fully Extended: 24"H).
• All-Inclusive Package: Complete with 1 manual crank handle, 1 drill socket (3/4"), 8 mounting screws (3/8"), and a detailed instruction manual — ready to use out of the box.
• High-Strength: Engineered with ultra-durable high-tensile steel for exceptional load-bearing performance. Zinc-chromate-finished hardware passes salt spray testing for superior rust protection and longevity.
• The OULEME Advantage: OULEME is dedicated to RV lifestyle solutions with a focus on craftsmanship and quality. We offer professional customer service backed by brand expertise.

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Ryansunoro Jack Blocks – 40,000 lb Capacity with Bag

The Ryansunoro jack blocks are crafted from industrial-grade polymer with UV-resistant additives, and they support up to 40,000 pounds total—10,000 per block. That’s overkill for most trailers, but it means zero worry about cracking or crushing during long term storage.

These blocks fit most RV stabilization systems, including tongue jacks, scissor stabilizers, and 5th wheels. The non-slip surface texture keeps things stable on gravel or asphalt, and the reinforced nylon carry bag with dual handles makes transport and storage simple.

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• Heavy Duty Construction: Crafted from industrial-grade polymer with UV-resistant additives, RV trailer jack blocks withstand up to 40,000 lbs total weight capacity 10,000 lbs per block. Engineered to resist weather extremes, oil stains, and long-term outdoor exposure
• Universal Compatibility: Fits most RV stabilization systems. Our jack pads is for motorhomes, trailers, RVs. Fits most trailer jacks with Wheel, RV Camper, Pop Up, Boat, etc. Reduces 95%+ of trailer sway when properly installed
• Precision Leveling System: Non-slip surface texture maintains stability on uneven ground, gravel, or asphalt surfaces. Virtually eliminates all motion and sway in parked RVs and trailers
• Portable Storage Solution: Includes reinforced nylon carry bag with dual handles. Each block features integrated side handle and rope attachment points for easy transport between sites
• Support: Each set includes 4RV Jack Blocks 6"H x 11.5"L x 11.5"W and storage bag. If you have any questions after purchase, please contact us at first, we will glad to help you solve the problem

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ROBLOCK 8-Inch Jack Block – Extra Height Stability

The ROBLOCK 8-inch trailer jack block adds extra height so your jack doesn’t need to extend as far, which improves leveling efficiency and stability. This is especially useful on uneven ground where a standard 6-inch block falls short.

Built from high-performance polymer, it resists sun, mud, and oil, and integrated drainage holes prevent water from pooling on top. The wide base and one-piece structure eliminate sway and sinking, and the interlocking design lets you stack multiple blocks for even more height.

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• 8" Extra Height: The increased height of the 5th wheel accessories means your jack doesn't need to extend as far, greatly improving the efficiency and stability of leveling. This design makes it much quicker to lift your RV and lessens wear on the jack
• Built to Last: Crafted from high-performance polymer, the RV jack blocks hold up against sun exposure, mud, and oil. Integrated drainage holes ensure no water accumulation even on rainy days, engineered specifically for diverse outdoor conditions
• Strong and Stable: A wide base combined with a solid one-piece structure allows the ROBLOCK trailer jack block to eliminate sway and sinking of the RV effectively. Even on uneven ground, it creates a steady living space for you. G.V.W 40000 lbs
• Flexible Stacking Design: A unique interlocking design allows the RV trailer accessories to be firmly stacked, and you can easily adjust them to the right height. When not in use, they nest together neatly, greatly minimizing the space needed for storage
• Lightweight and Portable: Each block weighs just 3.75 lbs. With the handle and rope, you can easily carry the RV blocks wherever you need them. They are excellent for taking on camping trips so that you can leave heavy pavers or wooden blocks behind
• Versatile Compatibility: With a dimension of 12 x 12 x 8 inches per block, it supports nearly any tongue jacks, wheel jacks, scissor stabilizers, and more. Whether snow, grass, sand, or gravel, it ensures a level and solid foundation for your campsite

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Andersen Hitches Jack Blocks – Magnetic Quick Support

The Andersen Hitches 3608 jack blocks come in a 2-pack, each rated for 8,000 pounds single stacked and 1,500 pounds double stacked. The built-in magnets on top lock directly onto your trailer’s round jack pad, so the block stays put even if you bump it.

With an 8-inch height and a 12-inch base, these blocks handle significant grade differences while providing a wide, stable footprint. The magnetic connection eliminates guesswork during setup, making them a favorite for quick campsite leveling.

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• TWO JACK BLOCKS FOR COMPLETE CORNER SUPPORT: A two-pack lets you support multiple stabilizer jacks at once — setting up your campsite is faster and more stable with two blocks on hand.
• RATED FOR 8000 LBS SINGLE STACKED: Each block holds up to 8,000 lbs single stacked and 1,500 lbs double stacked, providing a firm foundation for your RV's stabilizer or leveling jacks.
• BUILT-IN MAGNETS LOCK ONTO YOUR JACK PAD: The magnets on top of each block connect directly to your trailer's round jack pad, keeping the block from shifting and eliminating guesswork during setup.
• 8-INCH HEIGHT WITH 12-INCH BASE FOR STABILITY: The tall profile handles significant grade differences while the wide 12" base prevents tipping, even on softer ground or uneven terrain.
• LIFETIME WARRANTY FROM ANDERSEN HITCHES, MADE IN THE USA: Both blocks are built in America and covered by Andersen's lifetime warranty — built to last and backed if they don't.

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Buyer’s Guide: What to Consider

Choosing the right stabilizer jacks for long term storage involves balancing capacity, durability, and ground conditions. Here are five key factors to weigh before you buy.

• Weight Capacity: Match the jack's capacity to your trailer's weight. A 9,000 lb scissor jack suits heavy travel trailers, while 1,000 lb jacks work for small campers. Overloading leads to failure.
• Height Range: Consider the ground clearance and how much adjustment you need. Scissor jacks with 4-24 inch range offer flexibility, while telescoping jacks with 12-18 inch travel are simpler.
• Corrosion Resistance: For long term storage, look for coatings like electrophoretic paint, zinc plating, or zinc-chromate finishes. These protect against rust from moisture, salt, and soil contact.
• Base Support: Jack pads or blocks spread the load and prevent sinking into soft ground. Look for wide bases, honeycomb structures, or interlocking designs to enhance stability on uneven terrain.
• Ease of Use: Power-drill sockets speed up setup, while magnetic blocks simplify positioning. Consider how often you'll adjust the jacks and whether you prefer manual cranks or drill compatibility.

Conclusion

For long term storage, the best choice depends on your trailer’s weight and your storage site. Heavy trailers benefit from high-capacity scissor jacks like the LIBRA or OULEME sets, while lighter rigs can rely on telescoping options like the MaxxHaul.

Don’t forget jack pads—they prevent sinking and add stability on soft ground. Pair a sturdy jack with a quality pad, and your trailer will stay level and secure for months.