ROBLOCK Trailer Jack Blocks 6" Stackable 4-Pack — 11.5" Base, Heavy-Duty UV Polymer Stabilizer

These ROBLOCK 6" stackable trailer jack blocks (4 per set) stabilize and level RVs, travel trailers, fifth-wheels and scissor or round jacks quickly and securely.

Designed from a high-performance polymer with UV-resistant additives, this 4-piece set gives a compact, durable solution for reducing sway and movement when your RV is parked. Each block supports heavy loads and stacks to achieve extra height, while a included rope-and-bag system keeps the set organized for transport. The footprint and shape fit most tongue jack feet, round 5th wheel hydraulic feet, scissor stabilizers and square posts.

How do these blocks reduce RV wobble and movement?

The ROBLOCK blocks create a wider, more stable base that prevents jack feet from sinking into soft ground or shifting on gravel. When stacked and positioned correctly they lock the jack in place and transfer load across a larger surface area to minimize rocking.

• Solid polymer construction disperses weight evenly
• Large 11.5" x 11.5" base resists sinking on soft surfaces
• Stackable design lets you build height and stability as needed
• Compatible with round, square, scissor and hydraulic jack feet

How much weight can each block handle and what are the dimensions?

Each block is engineered to withstand heavy loads suitable for typical RV applications without deforming under stress. The physical footprint and stackable 6" height make them convenient for leveling while providing a reliable support surface.

• Rated capacity per block: G.V.W. 40,000 lbs (designed for heavy-duty support scenarios)
• Individual block height: about 6 inches
• Top and bottom dimensions: approximately 11.5" by 11.5"
• Four-block set allows multiple stacking height combinations

How portable and user-friendly are the blocks for travel and storage?

The set includes a storage bag and a carrying rope, simplifying transport and keeping the blocks tidy in your garage or cargo area. A side hole in each block pairs with the rope for quick lifting, and the lightweight polymer construction makes handling straightforward for one person.

• Includes drawstring storage bag to protect blocks and save space
• Integrated side hole for rope carry or tethering to trailer
• Stacking edges align for secure placement and simple uninstall
• Polymer resists dirt, oil and UV degradation for long-term use

Will these work with my trailer's specific jack or stabilizer?

ROBLOCK blocks are shaped and sized to accommodate most common jack foot styles, from tongue jacks to fifth-wheel hydraulic feet and scissor stabilizers. Their broad surface and open-fit top let you center many different foot types; for unusual or oversized feet, measure the contact area to confirm fit.

• Compatible with 9" round 5th wheel hydraulic jack feet and standard tongue jacks
• Works with square and round posts, scissor stabilizers, and many aftermarket feet
• Broad top plate reduces pressure points under small jack feet
• Stacking lets you adapt to uneven terrain or taller jack requirements

Who is this for: The ROBLOCK 6" 4-piece trailer jack block set is intended for RV owners, weekend campers, and professional haulers who need a compact, durable way to stabilize and level trailers on a variety of surfaces. It suits anyone who wants an easy-to-carry stabilizing solution that fits most jack feet and fifth-wheel hydraulic systems without bulky metal plates.