My 2 cents (except we don't have pennies anymore):
You likely have a piece of sheet metal behind the wall finish if it was set up by the factory to be mounted in that location. Get a magnet and move it around to find where it is. If you find it, I'd drill some small pilot holes for the screws. If you can't find it, you need to do as BFlinn says but you can find a mount that doesn't need plywood to span the studs. But you may not even have studs near that location.
If you haven't got the TV yet, you could do comparisons of weight between different brands. The 32" in our TT weighs next to nothing.
If you are thinking of an articulating mount, then you definitely must think about a more substantial method of securing to the wall. See what's available at: RV TV Mounts & Mounting Brackets for Your RV FREE Shipping
(a forum sponsor) They should have a mount that will work for you and I'm sure they can help if you contact them. They've also got other RV goodies at good prices....
Otherwise, if you have a brand new unit, can't the dealer tell you anything?