Asking about wax brand on an enthusiast forum is like asking which motor oil.
I suspect that Mort B is correct when he states it's the frequency of application that's most important. I've used various Meguires products on the trailer ( it's what I use on the trucks, cars and motorcycles ) and I have also used plain old inexpensive Turtle Wax on the trailer.
I've settled on Turtle wax applied and buffed off with a rotary buffer as my choice.
So in the this thread we have learned that Dennis H is really brave when the "boss" isn't around ;) , and that owl poop is the standard to compare.