BEORE a trip I detail out my TV and TT from bow to stern inside and out. They glisten! But obviously weather and road take their toll and it doesn't take more than a day or two before the shine is cov...
Unless your TT has full body paint, it doesn't need any wax/sealant. UV protection would be about it, and Aerospace 303 does the trick for me. I use it a few tiimes a season on everything outside the TT. That said, keeping the surface waxed will help keep it clean and make for easier washing. As you know, detailing an RV takes a lot of time. I highly recommend a synthetic polymer that will last at least a year over the more common carnuba based waxes.