Best Wax for Fiberglass Trailer?

My experience is the best thing you can do to make it come out nice with the least physical labor is to use a buffer. I have both "random orbital" and "right angle rotary". The rotary does a far superior job and is a real labor saver. You can buy one fairly cheap at harbor freight, but the ones I tried from there were junk. I got one from Northern Tool ( Klutch brand ) that is also china made, but it actually works well and has been reliable except if you let it spin too slow..... it will get hot and shut down until it cools. Let it spin a little faster....keeps it cool.
As for wax, I use various Meguiers on the trucks and cars, so I use that also on the trailer, but to be honest, good old cheap turtle wax seems to work about as well.