Many 5th wheel trailers have some bulging in the rear. The rear is a flexible panel with fiberglass insulation behind it unlike the side walls which are laminated and should not bulge.
The reason for the difference is because all the electrical and cable/satellite wires run up from inside the back wall. That is why it is not a laminated wall.
If you brows through trailers at a dealer you will see many with bulging panels on the rear walls.
So before you think you have a problem check and make sure this isn't what's going on with your trailer.
Good Luck and safe travels.
Oh, and btw I would be careful of sales people!
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