Marine

4-Inch Magnetic Jack Blocks — 2-Pack for RV & Trailer Jacks

5.0 6 reviews 1 min read

4-Inch Magnetic Jack Blocks — 2-Pack for RV & Trailer Jacks

Product description

This set includes two 4-inch magnetic jack blocks sized for RVs, fifth-wheels, and heavy trailers. Each block is molded from high-strength polymer and contains built-in magnets that align and hold the block against round jack pads as you lower the jack.

Each block is rated at 30,000 pounds, providing support for large Class A motorhomes and hefty trailers while maintaining a compact 4-inch profile. The top surface accepts round jack pads up to 9 inches in diameter and the magnets keep the block anchored to prevent shifting during use.

Use the blocks by placing them beneath the jack pad; the magnets pull the block into position so you can lower the jack without crawling under the rig to adjust placement. A 2-pack lets you set front or rear jacks simultaneously for faster, more complete leveling.

The low height is useful when campsite grade or clearance makes taller blocks impractical. Manufactured in the United States and covered by a lifetime warranty, these blocks are aimed at owners who want robust support with minimal fuss.

Pros

  • High 30,000 lb rating per block
  • Magnets hold blocks to round jack pads
  • Compact 4-inch profile for limited clearance

Cons

  • May be short for very uneven sites
  • Only fits round jack pads up to 9 inches
  • Not adjustable height — single fixed size

VerdictA compact, heavy-duty solution for stabilizing RV and trailer jacks. The 2-pack lets you handle two jacks at once; embedded magnets secure the blocks to round jack pads, and each unit supports up to 30,000 lb. Ideal when you need strength without extra height.

Reviews

  1. Stanley 5/5

    Solid build

    Well-made and performs exactly as expected.

  2. karen jones 5/5

    Worth the upgrade

    Totally worth it. If you think the 4" will do, consider the 8" for taller clearance.

  3. David Richardson 5/5

    Simple and convenient

    Easy to position — no more kneeling on gravel to set pads.

  4. Martha 5/5

    Surprisingly sturdy

    They’ve held up well and feel stronger than my prior taller blocks.

  5. Joe O. 5/5

    Just the right height

    Replaced a stack of smaller levelers; the magnets help place them precisely.

  6. chuck willis 5/5

    Durable and time-saving

    Very pleased with the construction and magnetic hold — saves time on setup.

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