The answer on studs - sort of...
The outside wall is laminated construction, that means aluminum 'studs' with foam sandwiched between the inner and outer wall. An electronic stud finder with a metal setting should help you find one, but don't necessarily expect 16"o/c like house construction. They also add wood backers where accessories attach, so there may be something there, although my track attaches to the ceiling.
I think (not sure) that the wall between the bunk and bath is more traditional construction based on what I have seen in videos of the assembly line. Might actually be wood construction (I know the knee wall beside it is on my X19H). Again, a stud finder on wood or metal would help determine this (try it from the bunk side as the shower surround might interfere).
Warning as well about fastening to the exterior wall. These walls are only about 1" thick and the foam is solid. Look carefully at a door or window frame to see just how thin they are. If you don't have a stud or backer where you need it, your options are limited. Drywall anchors would probably pull out as the inner wall panels are thin and not as sturdy as drywall. Butterfly bolts run the risk of not opening with the surrounding foam, and you run the risk of perforating the outside wall if you try to pilot out a hole.
I have yet to put a hole through a wall to hang anything in ours. We rely on the wide variety of Command products to put stuff up on the wall. The things that Jayco does screw into the wall (towel and toilet paper holders) pull off with the lightest of pressure.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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