I bought my class a pace arrow with delamintation, it is mainly on the drivers side rear and drivers front , but also on the pass. rear. I was told it was caused by someone towing without the rear frame reinforced, but I was also told that the weather caused it by some one else. I have noticed it to be a little worse since I have used it over that past month or so since I first purchased it this summer. Any help on solving the cause would be greatly appreciated.