Trailer Jack Blocks 5-Pack - USA Made Up to 18,000 lb Capacity

In this review of the 5-pack USA-made trailer jack blocks, the bottom line is simple: these are heavy-duty jack pads built for campers, travel trailers and 5th wheels that need a secure, sunk-resistant footing. The reviewer found them most useful for RV owners and trailer haulers who want a durable, UV-resistant support option rated up to 18,000 lb when used with flex pads, and appreciated that they are made in the USA from recycled plastic. This review focuses on real-world stability, build method and who benefits most from choosing these jack blocks.

Key Features

• Durable construction: Forged recycled plastic construction provides stronger walls than typical injection molded blocks, so they resist deformation under heavy tongue loads.
• High load rating: Rated up to 18,000 lb when paired with compatible flex pads, offering plenty of capacity for most trailers and 5th wheels.
• UV resistant: Material is formulated to resist UV degradation so the pads hold up outdoors and in sun-exposed storage.
• Stackable design: Blocks can be stacked to adjust height and adapt to uneven terrain or different jack lengths for a customized fit.
• Universal fit: Dimensions of 10 x 10 x 4 in make these blocks suitable for round or square jacks, feet, posts and stabilizers for motorhomes, campers and boats.
• Made in the USA: Produced domestically from recycled plastic, offering a locally made option with thicker material and consistent build quality.

Who It's For

This set is aimed at RV owners, travel trailer and 5th wheel users who need a reliable, heavy-duty pad to prevent jacks from sinking into soft ground or moving on gravel and dirt. It is especially useful for those who value a US-made product and plan to use the blocks frequently in campsites, long-term parking or loading scenarios.

It may be less appealing to occasional users who only need lightweight, inexpensive single pads or to buyers who require non-slip rubber surfaces as the forged plastic can be somewhat slick under certain conditions. Those seeking a different height or material should compare other leveling options.

Pros & Cons

Pros

• Thick forged plastic construction offers notable strength and resistance to crushing under heavy loads.
• Rated to support up to 18,000 lb with flex pads, covering a broad range of trailer capacities.
• Stackable 10 x 10 x 4 in design adds versatility for different terrains and jack heights.
• UV resistant and made in the USA from recycled materials, which supports longevity and sustainability.

Cons

• Some customers reported occasional cracking under extreme conditions, so inspect blocks used frequently under heavy stress.
• Surface can be slippery on wet or oily jacks without an added flex pad or textured adapter.

Specifications

Our Verdict

These 5-pack trailer jack blocks represent solid value for RV and trailer owners who need a sturdy, stackable support that withstands heavy loads and outdoor exposure. The forged recycled plastic construction and 18,000 lb rating make them a practical choice for regular use, while the small risks of cracking or slipperiness can be mitigated with care and the use of flex pads for better traction.

Frequently Asked Questions

Are these blocks suitable for 5th wheel tongue jacks?
Yes. The 10 x 10 x 4 in size and thick construction fit most tongue jacks, feet and stabilizers used on 5th wheels when properly positioned.

Can they be stacked to increase height?
Yes. The blocks are designed to be stacked to achieve the needed height and to adapt to uneven ground.

Will they crack under heavy use?
They are built thicker than typical injection molded pads and rated high, but some users reported cracks under extreme or repeated stress, so inspect regularly and use with flex pads for added protection.