From what I've noticed on my 06 the framing is square aluminum, something on the order of 1 1/4". Very thin inner wall board and the plywood/filon outer skin sandwiching foam insulation. If you were to attach a backer board as shown by Roy you could catch the framing and screw the tv bracket to the board.
I used toggle bolts in the bathroom outer walls for towel hooks, had to push the insulation out of the way with a screwdriver to make room for the toggle bolts. Used 3/4 pine for backers for these giving me room to use 2 toggles, worked well.
Either way would probably work, but I personally would not attach the bracket directly to the wall unless you got lucky and found a framing member.