Trailer Jack Block 2 Pack RV Stabilizer Blocks - Adds 4in Lift

In this review of the Trailer Jack Block 2 Pack, the bottom line is simple: these heavy duty RV jack blocks are for owners who need a compact, reliable way to firm up a parked trailer or fifth wheel. The reviewer found they deliver the primary benefit advertised - solid, low-profile support that eliminates most sway and movement - while fitting round, square and scissor-style jack feet. If you want a straightforward, stackable solution that provides about 4in of lift and supports very heavy loads, this set is worth considering.

Key Features

• Load capacity: Each block is rated to support up to 15,000 lbs, providing confidence under heavy trailers and 5th wheels.
• Lift height: The block delivers roughly 4in of lift which helps level and stabilize the tongue jack without complex setup.
• Stackable design: Blocks stack cleanly to gain additional height when a single 4in increment is not enough for clearance.
• Wide compatibility: The block works with round or square jack feet, 9in round jack feet and most tongue jacks, posts, feet and scissor stabilizers.
• Stability improvement: Placing these under the jack greatly reduces sway and movement in parked RVs and trailers for a more secure campsite.
• Durable construction: Heavy duty material and a low profile mean the blocks resist deformation under load and stay in place.

Who It's For

The Trailer Jack Block 2 Pack is ideal for RV owners, tow vehicle users and fifth wheel drivers who need an easy-to-carry stabilizer that works with a variety of jack types. It particularly suits people who prefer a simple mechanical solution that stacks for extra height and delivers a predictable 4in lift per block.

Those who should look elsewhere include campers who need integrated hydraulic leveling systems or very tall lift solutions where a purpose-built jack extension or full leveling kit is required. This set is a complement to, not a replacement for, vehicle-mounted power leveling gear.

Pros & Cons

Pros

• High per-block load rating provides reassurance under heavy trailers and 5th wheels.
• Stackable for additional height while remaining compact in storage.
• Compatible with a wide range of jack feet and stabilizers, simplifying campsite setup.
• Noticeably reduces sway and movement when placed under the jack foot.

Cons

• Each block provides about 4in of lift, so multiple blocks may be needed for larger height gaps.
• The rigid design means occasional repositioning on very soft ground may be required for maximum stability.

Specifications

Pack	2 blocks
Maximum support per block	Up to 15,000 lbs
Lift per block	Approximately 4 in
Compatibility	Round, square or scissor jack feet; 9 in round jack feet; tongue jacks; 5th wheel posts
Use case	Stabilizing and leveling RVs, travel trailers and 5th wheels
Stackable	Yes

Our Verdict

The Trailer Jack Block 2 Pack is a practical, cost-effective stabilizer for RV owners who want predictable lift and improved campsite stability. It pairs broad compatibility with a high per-block load rating, making it good value for those who tow heavy trailers and need a simple, stackable solution to reduce sway.

Frequently Asked Questions

Can these blocks be stacked for extra height?
Yes, the blocks are designed to stack so users can gain additional height beyond the single 4 in increment.

Will they work with my 9 in round jack foot?
They are compatible with 9 in round jack feet as well as square and scissor-style jack feet.

How much weight does each block support?
Each block supports up to about 15,000 lbs, suitable for most travel trailers and many fifth wheels.