I made these leveling blocks to go under the HWH hydralic leveling jacks so they wouldn't have to go as far to reach the ground, they will also help when I need to raise the MH a little more to get level in one of those great campsites that aren't as level as I would like. I made two short ones for the front and two taller ones for the rear. By running the 2x4's criss cross I hope they will be stronger and not break, they are glued and screwed together. I always use wheel chocks to block the wheels that stay in firm contact with the ground so the MH won't roll