If you have a new unit, which you do, wash it with a good automobile wash/wax product like Turtle Wax Ice. It does a good job of cleaning and adds a bit of "This Century" chemistry to add a shine. Next go buy ANY spray on / wipe off detailing spray that contains some UV protection. You can use Aerospace 303 all over your TT including walls, roof, tires, decals to give them a nice look and protection.
You can probably do your whole trailer in an hour or so from start to finish. Some spray on products allow you to put it on a wet surface which speeds up the process.
I am still up to "Wax on - Wax Off" but choose not to.