Agree, agree and agree that using an appropriate RV cover is the difference and we have always covered our ROO and will order a cover for our new TT. Back in our boating days, those humongous blue tarps were all that were used, then came the white shrink wrap covers. We always had some blue scuffs that had to be cleaned off. Tarps, do not breathe. Adco, or similar, do breathe therefore much less chance of dampness = mold or mildew. Our thought is that we spent a lot of money for a TT and want it to look as good as new for as long as possible, so a $200 - $300 investment in the right cover is good insurance. BTW, our ROO cover was bought in the fall of '07 and other than a couple of very minor holes that a piece of duct tape took care of, it looked just like Day #1 when it went to its new home this past May.