ROBLOCK 6in Trailer Jack Block — Stackable RV Camper Stabilizer, 40,000 lb Capacity, Includes Bag

ROBLOck 6" trailer jack block is a heavy-duty, stackable stabilizer that supports up to 40,000 lbs and isolates sway for tongue jacks, 5th wheels, scissor stabilizers, and more.

When you park a travel trailer, camper, or fifth wheel, a reliable jack block makes leveling easier and reduces rocking or sinking on soft ground. The ROBLOck jack block is molded from a high-performance polymer with UV-stable additives for long life around dirt, oil, and weather. It ships with a convenient storage bag and built-in carry rope so you can keep your campsite tidy and adjust height on the fly.

How does this jack block improve stability when my trailer is parked?

The block provides a wide, solid platform beneath jack feet and stabilizers to spread weight and prevent sinking. Its rigid construction reduces lateral movement and nearly eliminates sway, especially on soft surfaces or uneven ground. Stackable sections let you fine-tune the height to achieve a steady setup without leaning on awkward shims.

• Supports up to 40,000 lbs G.V.W. per block for heavy loads
• Wide 11.5" x 11.5" footprint disperses pressure across soft ground
• Stackable 6" height sections for quick level adjustments
• Compatible with round, square, and specialized jack feet including 9" round 5th wheel feet

Will these blocks fit my tongue jack, scissor stabilizer, or 5th wheel foot?

Yes — the design accommodates most jack foot shapes and sizes, including round, square, and scissor-style stabilizers. The tall, broad profile cradles different foot types while preventing slipping or rotation under load. That versatility means you can rely on one block for multiple jacks and trailers in your fleet.

• Accepts round and square jack feet and common 5th wheel hydraulic foot sizes
• Works with scissor stabilizers and many aftermarket jack feet
• Universal stacking lets you match heights across different contact points

How durable and weather-resistant are these blocks?

Manufactured from a reinforced polymer blend with anti-UV additives, these blocks resist cracking, fading, and contamination from dirt and grease. The material retains structural strength in outdoor conditions and is easy to clean after muddy or oily use. Rugged construction ensures repeated use without deformation under heavy static loads.

• High-performance polymer resists oil, grime, and UV degradation
• Designed for repeated heavy-load use without warping
• Easy to wipe clean and store in the included protective bag

How portable and easy to store are the ROBLOck blocks?

Each block includes a side hole and rope for comfortable carrying and quick placement. The set comes with a compact storage bag to keep blocks together and out of the way when traveling. Their lightweight-but-strong design balances portability with the load-bearing performance needed on-site.

• Side carry hole plus rope for one-handed transport
• Includes storage bag to save space in your RV or garage
• Single 6" block packs easily yet stacks for greater height

Who is this for? The ROBLOck 6" Trailer Jack Block is ideal for RV owners, weekend campers, and professional haulers who need a dependable, portable platform to stabilize trailer jacks and 5th wheel feet. If you value quick leveling, reduced sway, and durable gear that resists weathering and grime, this block gives a practical solution for single or multi-point stabilization on varied ground conditions.