I've done my trailer by hand, with the DA orbital, and with my rotary polisher. By far the "easiest, best, quickest" is using the rotary.
I use whatever wax I have around which is usually a Meguiers product, although I did buy a bottle of good 'ol cheap Turtle Wax also just for the trailer.
To reach the curved front cap, I have a folding harbor freight table that is made to hold a power miter saw. It's legs are spread enough, and it's top is tall enough to straddle the propane tank covers. Safe enough to stand on and reach all the way to the top.
Unlike some, I don't take any special precautions for the decals. I wax right over them with the buffer, and they are fine after almost five years.
Trailer gets waxed 2 or 3 times a year, which is probably more than needed, but hey, I'm also the guy that waxes my truck every month....so what do I know.....:)
