While out camping in our PUP this past weekend I went to re-enter the camper and noticed there was a gap of about 1/8 of an inch along the door (non hinge side). The PUP was fairly level and as that door is an integral part of the PUP it concerned me that we suddenly had a gap where there hadn't been one before. I then realized that my wife and kids were having a nap on the rear bunk, and once they got up I noticed the gap dissappeared. Our PUP is a 1999 Palomino Yearling where the "travel door" stays on the camper and you swing down the upper door/frame to make one big door. My question is this: Is that kind of flexing of the box normal? Does it indicate that the aluminum body/frame is not bolted onto the steel a-frame tightly enough? I added some extra weather stripping to compensate for any kind of flexing, as the gap would be enough at night to allow a lot of bugs to enter the PUP. Hoping I don't have a structural integrity issue!