Depends on the TT. If it is an "ultra-lite" or liteweight TT, the walls are covered with 1/8th inch thick covering, with nothing behind that covering but air. So be certain you find a stud to screw the TV mount into. And even if you screw the TV mount into a stud, you should probably dismount the TV and store it in the bathtub or some such when on the road.
My new ultra-lite TT came with the optional wall mount for the TV already installed by the factory. But the Owner's Guide emphasized that the TV must be removed from the wall mount before the TT is towed. The trailer bouncing that JohnBoyToo
mentioned is enough to tear the wall mount, with even a small flat-screen TV mounted, out of the wall, even if it's properly screwed into a stud in the wall. (The studs in an ultra-lite TT are very small).