ROBLOCK 8-inch Trailer Jack Block with Handle — Heavy-Duty RV Stabilizer, Stackable & Weatherproof

ROBLOck 8" Trailer Jack Block with Handle is a heavy-duty, weatherproof stabilizer block that raises and supports RV jacks, posts, feet and stabilizers to create a solid, level base at campsites.

When you need dependable support for travel trailers, fifth wheels, or any towable with a tongue jack, this 8-inch block gives extra height and improved stability so your jack doesn’t have to extend as far. Made from a high-performance polymer, the block resists sun, mud and oil while remaining light enough to carry. Its interlocking design stacks securely for adjustable height and nests compactly for storage, making it a practical addition to your RV toolkit.

How does the extra 8" height make setup easier?

The additional height reduces how far your jack must extend, which speeds lifting and reduces mechanical strain on components. With less extension needed, you’ll experience smoother leveling and less wear on the jack over time.

• Shortens jack extension for faster lifting
• Decreases wear and tear on jack mechanisms
• Provides extra clearance on uneven or soft ground
• Ideal for fifth wheels, tongue jacks and scissor stabilizers

Is this block durable enough for outdoor conditions?

Yes — the block is molded from a durable polymer engineered to withstand UV exposure, moisture, oil and mud without cracking or degrading. Integrated drainage holes prevent water pooling so the block stays functional even after rain.

• High-performance polymer construction resists cracking
• Drainage holes stop standing water and freeze damage
• Stable under heavy loads — rated for heavy RV GVW up to 40,000 lbs
• Works on grass, sand, gravel, mud and paved surfaces

Can the blocks be stacked and transported easily?

The blocks feature an interlocking geometry that stacks securely for incremental height adjustments and nests compactly when not in use. Each unit weighs about 3.75 lbs and includes a handle and rope, so carrying multiple blocks on a camping trip is straightforward.

• Interlocking design for firm stacking and adjustable heights
• Nesting profile saves storage space in cargo areas
• Lightweight 3.75 lb construction with built-in handle and rope
• Portable enough to replace heavy pavers or wood blocks

Which jacks and stabilizers is the block compatible with?

The 12 x 12 x 8-inch footprint and broad base accept a wide variety of jack feet and stabilizer types, including round posts, square posts, scissor stabilizers and standard tongue jacks. Its broad contact area reduces sinking and sway, providing a firmer living space at the campsite.

• Fits tongue jacks, fifth wheel jacks, scissor stabilizers and posts
• Wide base minimizes sinking on soft ground
• One-piece construction eliminates wobble and sway
• Reliable support across a variety of terrains

Who is this for? The ROBLOck 8" Trailer Jack Block is made for RV owners, weekend campers and full-timers who need a compact, durable solution to improve jack performance and campsite stability. It suits anyone hauling travel trailers, fifth wheels or campers who wants faster setup, less jack wear, and a safer, steadier foundation without hauling heavy materials. Keep one or a stack in your RV gear for quick, reliable support wherever you camp.