The studs are not very wide in the RV's even if you find one... You get the best results by using something that spreads out when you tightening it up...
We have great success on the inside using the MOLLY BOLTs to do this...
It really works great to use the moly bolts to support a large piece of 3/4-inch plyboard and then just use regular screws etc to hang your items to the large section of wood...
Much like this pictorial suggests...
On the inside would look something like this with a large backboard installed to mount your heavier items like LCD TV's...
Roy Ken