4in Jack Block with Magnets - Heavy Duty RV & Camper Support

Our review of the 4in Jack Block with Magnets finds it to be a straightforward, heavy-duty support solution for RV owners, campers and trailer haulers who need a compact, reliable pad under their trailer jack. The single biggest reason to buy is the combination of a wide 12in base and a 50,000 lb support rating that delivers confidence on uneven or soft ground, while the built-in magnets and finger holes make placement quick and precise. This is a practical, no-nonsense accessory for anyone who routinely levels or stabilizes trailers.

Key Features

• Heavy-Duty Support: Rated for up to 50,000 lb, the block provides exceptional stability for campers, toy haulers or utility trailers when parked or stabilized.
• Compact Footprint: At 4in tall with a 12in diameter base, the block offers a low profile that still spreads load over a large area for better ground contact.
• Fits Common Jacks: The top accepts up to a 9in round jack pad so it works with most RV and trailer jacks without slipping.
• Easy Alignment: Built-in magnets help the jack land squarely on the pad for faster, safer setup, especially in low light or tight spaces.
• Simple Handling: Integrated finger holes let one person position the block cleanly without bending or awkward grips.
• Made in USA: Domestic manufacture and a lifetime warranty point to durable construction and long-term value.

Who It's For

This jack block is best for RV and trailer owners who want a durable, reusable solution to prevent jacks from sinking on soft ground or shifting on uneven campsites. It suits people who tow campers, toy haulers or utility trailers and need a solid, portable pad that fits common round jack pads.

Less suitable for users who need variable height stacking beyond 4in or specialized leveling systems; those requiring adjustable telescoping blocks or multi-height platforms should look for multi-piece leveling sets instead.

Pros & Cons

Pros

• Very high load rating gives confidence under heavy trailers and toy haulers.
• Wide 12in base spreads load to reduce sinking and improves stability on soft surfaces.
• Magnets and finger holes make placement quick and reduce setup fumble.
• Lifetime warranty and US manufacture indicate long-term durability.

Cons

• Fixed 4in height means limited flexibility if different stacking heights are needed.
• Relatively compact size may not distribute load as well as larger multi-piece pads for very soft terrain.

Specifications

Brand	Andersen Hitches
Height	4in
Base Diameter	12in
Top Fit	Fits up to 9in round jack pad
Capacity	50,000 lb
Country	Made in USA
Warranty	Lifetime

Our Verdict

The 4in Jack Block with Magnets is a practical, high-capacity support pad ideal for RV and trailer owners who need dependable, quick-to-place stabilization. Its 50,000 lb rating, wide base and magnetic alignment deliver strong value for regular campers and haulers, though those needing variable heights should consider additional stacking options.

Frequently Asked Questions

Will this fit my trailer jack?
The top accepts up to a 9in round jack pad, so it fits most common trailer and RV jacks with round pads.

How much weight can it support?
It is rated to support up to 50,000 lb, suitable for large campers and toy haulers when used as intended.

Is it durable for long-term use?
Yes, it is made in the USA and backed by a lifetime warranty, indicating durable construction for repeated use.