if NO, then go ahead and use the conventional drywall and mud and fiber flex tape.
But if you plan to sometime move the trailer, then use the special trailer drywall. This is thinner and has its own special joiner sticks for both inside and outside corners and to join one sheet to another. I saw these babies and they are really nice, some even come factory wallpapered.
The movement of the trailer in transit will only cause a major mess with the regular drywall and the bedding compound. It wil either all come off or tear.