dpgllg:
Our unit is on a cement RV pad of land that we purchased. We have a landscaper who visits the property every week or so. The unit was Washed, waxed and seals lubricated just before we left. I check for sealant wear at least every 6 months. It will be 6 months when we return, and I get to do all this over again. I am sorry you had this problem with your unit, and you are right, it can happen any time to any unit. I am hoping that my vigilance caring for my 5er will pay off. We have lived in it full time for the last 6 years. Last year we did bring it North. This is our first year leaving it alone.