We stored our old TT at an outdoor facility in another state, and had it delivered to the camping park whenever we wanted to use it. It seemed like every time it was delivered, something was damaged on the outside. A gouge here, a scrape there. Dirt everywhere. Even grass from mowing while wet stuck to the skin of the camper. We keep our new one here at home now. Nobody else is allowed near it.
I know that's not an option for you, but, you might want to consider a high quality Adco (or similar) cover for your unit. Or, if you are a long-term renter, perhaps the property owner will let you install a metal RV port to park your camper under. This would go a long ways to helping preserve your roof and all the caulking.
