You can mount one but how well it holds while traveling is another story. I would start with a board big enough to handle the mounting bracket/arm and wide enough to get at least 4 heavy screws into two separatealum studs. You must hit the studs. I probably would also make it so that you can take it down while traveling. There are some who have done this but as I recall, most (if not all) take it down and lay it on the bed for travel.
We mounted a 30 inch in our living room using a slide out tray with a a backer piece in place of mounting directly on the wall to which is attached a wall mount. When we are traveling (we traveled this way in Alaska) we put foam around the TV to steady the bounce. So far 15K miles and no problem.
We have our26" LCD in the bedroom mounted on an LCD monitor arm mount. The pole is 28" high so it gets up high enough. My local dealer quoted me $400 in labor to install a mount tothe wall so I went this way instead. Ihad to drill a hole in the bedroom countertop to mount it. The LCD lays flat on the bed for travel.