[jsb5717]

I know from experience on an older 5er that, for me, it was possible to "tweak" or "spring" the frame just a little by jacking up one corner or another. There were times when the door would rub just a little and by relaxing the jacks the door would operate normally. The movement was very small but there was movement that could slightly rack the frame. It wasn't enough to damage anything but, in certain situations, it could be noticed. I don't know what kind of trailer we're talking about but just a thought.