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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. Available in either 4" or 8" height options, each Jack Block is designed to be used with up to 9" round jack pads.