It's important to use the correct screws with a cutting bit tip (see photo).
https://www.lowes.com/pd/Hillman-7-x...-Count/4313215
Campers are built with very light wood and regular wood screws, like deck screws, will split the 2x2 or 1x2 studs.
The cutting bit will minimize splitting to almost never.
Even if you think you may be screwing into aluminum studs I would advise using them.
Only the L & R exterior walls will have aluminum studs.
And at any critical spots there should be a 4" strip of metal laminated in-between the interior paneling and the foam insulation, to give the screws something to bite into.
Driver bit and screw head type aren't super critical but the one pictured is typical of the ones used by most RV manufacturers.