I used an inexpensive fixed mount from Best Buy for ours because a) I'm cheap and b) I wasn't sure what a swivel would do when the trailer was moving. I also picked up some different wall screws because the tips of the ones that came with it would have poked through the outer siding.
Insignia™ - Fixed TV Wall Mount
I had to mount it up higher than I wanted because you have to tighten down the final two screws from underneath. That also makes it difficult to remove if needed. I also had to pick up 90 degree coax and HDMI adapters because everything is tight up against the wall.
EDIT: We just leave ours mounted for travel and haven't had any issues so far.