ROBLOCK Trailer Jack Block 6" Heavy-Duty RV Stabilizer — 11.6" Base, Interlocking Stackable

ROBLOCK 6" Trailer Jack Block is a durable, high-performance polymer stabilizer that raises and steadies RV tongue jacks, posts, feet, and scissor-style stabilizers for safer, more level camping setups.

When you need a reliable support under your RV’s jack head that resists sinking, cracking, and water damage, this 6-inch jack block delivers a tall, stable platform while remaining lightweight and easy to handle. Designed to work on grass, gravel, sand, snow, and pavement, the block speeds up leveling and reduces strain on your jack by shortening the required extension. Built-in drainage, an interlocking stack design, and a molded handle make it practical for storage and transport on any outdoor excursion.

How does this block improve RV stability and prevent sinking?

The ROBLOCK block spreads load over a wide, rigid base so jacks don’t bite into soft ground. Its one-piece construction resists bending under heavy loads and the textured surface increases grip between the jack foot and block.

• Wide 11.6" base disperses weight and resists sideways movement
• Solid polymer body rated around GVW 40,000 lbs for reliable support
• Textured top and recessed jack seat reduce slipping
• Drainage holes prevent puddling that can soften substrate

Can these blocks be stacked to reach different heights?

Yes — the blocks feature an interlocking profile that lets you stack multiple units securely without shifting. When stacked, they create a taller, unified support column so you can fine-tune height quickly and safely.

• Interlocking lip and groove for stable vertical stacking
• Stacks nest for compact storage when not used
• Each block adds 6" of height — combine as needed for precise leveling
• Stable even on slightly uneven surfaces due to broad footprint

What makes these blocks durable and easy to use in outdoor conditions?

Manufactured from high-performance polymer, the blocks resist UV degradation, oil, and mud so they keep shape and strength season after season. A molded handle plus included rope makes carrying and placement straightforward, while the light 2.81 lb weight avoids adding unnecessary bulk to your gear.

• UV-stable polymer resists sun damage and cracking
• Integrated drainage prevents water accumulation and freeze damage
• Lightweight 2.81 lb design with molded handle for portability
• Easy to clean — hose off dirt and debris after use

Which jacks and setups will this block fit?

The 11.6 x 11.6 x 5.91-inch seat accommodates a wide range of jack heads including round, square, post, foot, scissor stabilizers and many fifth-wheel setups. Its neutral profile works with most common jack types so you don’t need multiple specialty adapters.

• Compatible with tongue jacks, scissor stabilizers, post feet and wheel jacks
• Roomy seat handles round or square jack heads securely
• Useful for trailers, travel trailers, campers, and 5th wheels
• Works on dirt, gravel, sand, grass, snow, and paved lots

Who is this for? If you tow a travel trailer, own a fifth-wheel, or frequently camp on soft or uneven terrain, the ROBLOCK 6" Trailer Jack Block is designed for you. It’s especially useful for RV owners who want a durable, lightweight solution to prevent jack sinking and reduce wear from over-extension. Ideal for weekend campers, long-distance travelers, and anyone who prefers compact, stackable gear that packs away easily.