I live in So. California and I have kept this 2008 5th wheel outside without a cover. I have approx. 3500 miles in use so far. I clean the roof about three times a year with full strength roof cleaner and protectant. How does one know if the roof needs a new paint sealing job? What does one look for? Do I need to have this trailer serviced and when? Like how many miles before I have the brakes checked? How ofter does the caulking really need to be cut off the roof components and re-caulked? I am getting a Tyvek cover for the trailer this week. I probably should have done this when I bought it; I know! TIA