looking for help sealing a roof

If the trailer is stationary, you could have a shrinkwrap (like on boats being stored) done on just the top of the trailer, allowing access to doors, windows, vents, etc. A few years ago, I had a guy shrinkwrap my trailer for the winter, and asked that he include vents in the material so that I could use it. I've re-used that cover every winter since. It comes down just far enough to cover the side marker lights. My trailer is almost 20 years old and I became leery of the EPDM roof membrane, which actually still looks good. Dunno if this info is useful or not.

Thanks for the advice. What is the best caulking? It is sitting in the Florida sun

What do you mean by "sealing" the roof?

All that it needs is to caulk the seams with the front/rear/sidewalls and the roof protrusions. Anything else fixes nothing except a heavy wallet.

I am more concerned about the sun in Florida, I haven't been out for a while do to my health cover or no cover at all Thanks for the input

I wouldn't think a 2018 would need the whole roof to be resealed. Maybe a few spots may need attention with a dab of quality self leveling sealant.