YUNNIEHOM Trailer Jack Block 6"H RV Stabilizer & Leveling Block — Heavy-Duty Polymer, 11.5" Wide Base, Stackable

YUNNIEHOM Trailer Jack Block 6"H is a heavy-duty, stackable RV support that adds 6 inches of stable lift and fits nearly any tongue jack, post, foot or scissor stabilizer.

Built from high-performance polymer with UV and anti-aging additives, this trailer jack block is designed to resist dirt, grime and oil so it lasts through seasons of outdoor use. Its extra-wide 11.5-inch base distributes load across softer surfaces like gravel or grass while supporting up to 40,000 lbs per stack. The built-in carry hole and included rope make transport and storage simple, and its universal fit works with round, square, scissor and 5th wheel landing gear.

How does this jack block improve campsite stability?

The wide footprint and robust polymer construction reduce sinking and rocking by spreading the load across a larger surface area. When stacked, the blocks provide a predictable, non-slip platform under jacks and stabilizers so your trailer sits steadier on uneven ground.

• 11.5" extra-wide base for improved weight distribution
• High-performance polymer resists deformation and weathering
• Non-slip surface helps prevent jack foot movement
• Supports up to 40,000 lbs per block stack

Will this fit my trailer’s jack, foot, or scissor stabilizer?

The block is engineered for universal compatibility with most tongue jacks, trailer jack feet, wheel jacks, scissor stabilizers and 5th wheel landing legs. Its central recess and flat top accept round and square posts while providing a secure seat for foot plates of different shapes.

• Universal recess accepts round and square posts
• Works with scissor-style and fixed-foot stabilizers
• Flat top provides stable contact for various foot sizes
• Suitable for travel trailers, campers and 5th wheels

How do I carry, store, and stack these blocks?

Each block includes a molded side hole and comes with a rope for easy lifting and hanging when not in use. The blocks stack securely, so you can combine units to achieve the needed lift height without shifting or slipping under load.

• Molded hole plus rope for convenient transport and hanging storage
• Stackable design for flexible height — each block adds 6"
• Compact footprint for efficient storage in RV bays or garages
• Durable polymer stays lightweight yet strong for hauling

What surfaces are these blocks best for and how durable are they?

The wide base and rigid construction make these blocks effective on gravel, grass, packed dirt, asphalt and other uneven surfaces where jack feet can sink. UV and anti-aging additives improve lifespan and resistance to common outdoor contaminants like oil and road grime.

• Performs well on soft and uneven grounds
• UV-resistant polymer helps prevent cracking and fading
• Easy to clean — resists dirt, oil and grime buildup
• Engineered to withstand repeated outdoor use and load cycles

Who is this for: YUNNIEHOM Trailer Jack Block 6"H is ideal for RV owners, travel trailer and camper enthusiasts, and anyone who rigs up temporary or long-term leveling and stabilization outdoors. It suits weekend warriors who need a reliable, lightweight solution for uneven campsites, full-time RVers who demand durable gear that resists weathering, and contractors or landscapers who require a portable, universal support block for various jacks and landing gear.