What to look for in a used Desert Fox

So is it common for the front filon panel to be "floated" on these trailers? When I was up on the roof ladder I noticed the entire front panel seemed to not be attached to the wall except for the top edge, sides and bottom. It seemed to be the most noticeable about 6 inches from the top edge where it curved the sharpest to reach the top. There wasn't any cracks and the edges were very solidly attached, but it caught me off guard when I pushed on the front and the panel gave about a 1/4 inch or so before it hit a very solid backing.

Sorry for all the questions but thanks for all the answers! :-) This is my first RV purchase so I have a lot to learn. You guys have been a GREAT resource.