Basima Trailer Jack Blocks 6in 4-Pack — 40,000 lb Capacity, Stackable Polymer RV Leveling Pads with Carry Bag

These 6-inch jack blocks from Basima combine impact-resistant polymer and UV-stabilizing additives to deliver a compact, portable solution for campsite leveling and trailer support. Built to resist deformation on grass, gravel, dirt or asphalt, the four-pack stacks for adjustable height and doubles as a small seat or step when not used under jacks. The included carrying bag keeps the set tidy and ready for travel.

How do these blocks improve setup speed and stability?

The Basima jack blocks increase bearing area and reduce sinkage, so setups are faster and more secure compared with placing wood or flat pads directly beneath jacks. Their upgraded internal structure raises bearing capacity, resulting in steadier support and less movement while you level or load your trailer.

• 6-inch base height, stackable for customized elevation
• Improved internal ribs boost load-bearing capacity by ~50%
• Anti-UV additives resist cracking and weathering
• Side hand-holes for quick placement and removal

Will these work with my RV’s jack, stabilizers, or tongue post?

Yes — Basima blocks are designed to accept round and square posts as well as flat stabilizer feet and tongue jacks, making them compatible with most RV, camper and trailer hardware. The wide top surface and reinforced pockets give a secure fit across common foot shapes without slipping.

• Fits common round and square jack feet and stabilizer pads
• Large top footprint prevents rocking and reduces sinkage
• Suitable for trailers, motorhomes, yachts and tow vehicles
• Works on varied surfaces: asphalt, gravel, dirt and grass

How portable and durable are these compared to wood or metal pads?

Basima jack blocks are lighter than equivalent metal plates and won’t rot like wood, so they keep their shape and strength in outdoor storage. The polymer construction with UV inhibitors preserves performance season after season while the included bag simplifies transport and storage in limited space.

• High-performance polymer resists cracking and moisture damage
• Anti-UV formula reduces sun-related aging and discoloration
• Compact stackable design saves space in cargo areas
• Carry bag included for organized storage and quick access

How should I stack and position the blocks for safe use?

Place blocks on firm, level ground beneath the jack or stabilizer foot. Stack only as many as needed to reach desired height, align the jack foot centrally in the block pocket, and avoid side loading; inspect before and after raising to confirm secure seating.

• Set on compacted or level surface to reduce settling
• Center foot into the block’s pocket for even load distribution
• Stack blocks squarely; don’t offset layers under load
• Check seating after lifting and periodically during use

Who is this for: Basima’s 4-pack 6in trailer jack blocks suit RV owners, weekend campers, trailer haulers and marine enthusiasts who want a reliable, reusable leveling solution that’s weather-resistant and portable. If you need a compact set that supports heavy loads, stacks for height adjustments, and stows easily in a carrying bag, this kit is a practical addition to your campsite or trailer toolkit.