Originally Posted by bob caldwell
Jack on frame only!
Problem is that on our 5er the only exposed (well, with a thin skin over it) section of the main I-frame (running front to back) near the axles has an LP pipe running along it on one side of the camper, so there's no easy way to jack on the frame (which is partly why I'm hoping the Trailer Aid ramp will work out ok.
I understand the concern that jacking elsewhere on the axle could buckle it, since you'd have opposing force on two different points along the length, but the only risk (from simple physics) of jacking directly under where it's fixed to the chassis would be from crushing the casing. I sincerely hope that they're built to withstand that force (tho' I'm shocked that they're not tough enough to withstand jacking at any point)