[jackal]

I have a 2003 Springdale 29'. The problem I am having is on both sides of the slide out at the top on each corner, the aluminum siding is cracking. It is a straight crack running upward (approx 3-4 inches long). It is doing the same thing on the back entry door but the cracks are only an inch - 2 inches. The slideout is on the street side toward the front if the trailer.

Does anyone know what is causing this and how to fix it? Id really rather prefer to keep this trailer and not have to replace the whole trailer