Attach the Trailer Jack Block to the pad and level. It's that easy. The Trailer Jack Block offers 5th wheel & RV stabilization, all while reducing stress on your jacks. The built-in magnets instantly attach to the jack, so there is no need to double-check and adjust each block.

• Each block holds up to 6,000 lbs or 1,500 lbs when double-stacked
• 8" tall x 12" diameter base x 10" diameter top
• Made in the USA
• Covered under a lifetime warranty.