I always cover my rv's in the off season. One more trip for us here in the northeast and I put it to bed for the winter. Covers are ment to breathe otherwise you get mildew. I has ADCO's for two rvs but for what ever reason the last one after 3 years was showing wear and tear. Straps are need as its windy here. Never had any issues with water though. Ill order an ADCO before the end of the weekend. Yes putting in the 30 ft TT was fun, its gonna be way more fun 13 feet in the air on a 37 foot fifth wheel.....