The 1978 Rockwood RW-0806 pop-up I just bought only has two leveling jacks, at the rear - and they don't work any more (they appear to be LONG broken, in fact). They don't lock in the "up" or the "down" positions, and they won't ratchet. I want to get some kind of jacks to level and stabilize it, but what to get? It has rather low ground clearance, so I don't think the aluminum "pyramid" shaped screw jacks will fit under the frame. I have seen scissor type jacks originally meant for cars, going for reasonably cheap (under $20 apiece on EBay), and I was wondering if those would work, especially if some sort of pad was put under the base of each jack to keep them from sinking into the ground. Any suggestions?