I have an old 73 Camel Oasis camper, a bit of an oddball design, but very light weight to tow. It has an aluminum body, a very light fiberglass or plastic roof, and spring assisted lift arms. 3 of the springs in the arms are broken, but the top is so light it's easy to lift. The problem for me is that when I try to lift up one side and lock the arms in place, the whole top wants to slide too far forward off the body of the camper by a foot or so, making it really hard to extend the arms properly, and putting a lot of stress on the top. Once I get the arms extended on one end, I can go to the other end and manuever those arms up, but it's a hassle to get to this point. Anyone have any ideas what I'm doing wrong here? Why is the entire top sliding forward? Isn't there something that should be holding it from doing that?