I don't know about your particular trailer.
But, If you want to mount to an interior wall use an electronic stud finder to check the density of the wall. I used one to locate 1 x 2 & 1 x 3 vertical studs in the wall between the bedroom and living area. I located one that allowed the tv to be positioned at the center of the bed near the ceiling with the mount extended slightly outward from the wall and in the corner of the bedroom while not in use or when traveling. I drilled all the way through the wall and used bolts with the heads and large dia flat washers on the living area side with locknuts with flat washers on the bedroom side. It is very solid.
If you mount to an outside wall you can make a mounting board to allow multiple screws around the perimeter of the board to distribute the load over a large area. Use T-nuts from the back side to bolt the mount to the mounting board.
The stud finder when moved around also showed me there was a piece of plywood between 2 of the studs where the folding tv shelf was screwed to the wall. I could have screwed the tv mount there to the wall, but it was too low. The top of the shelf was at the top of the plywood.