Most of the interior wall paneling in trailers is 1/8" luan. Sometimes, if you're lucky, the screws will be located where they actually hit something to grip... Sometimes.... That said, most of the time, the screws are held in place by the luan only, with nothing more than solid foam behind them... They strip out relatively easy, are almost always in 2" thick walls and there's a real potential to "poke through to the outside" with almost anything you "stick in the stripped hole"....
Take a look at this you-tube video.
You can buy a similar tool on Amazon for about $15.
https://www.amazon.com/Anndason-Sett.../dp/B0711S75N9
Use the 4x32mm wall anchors (30 for $12)
https://www.amazon.com/Glarks-Plated...WQZA6NPP0&th=1
Hopefully, if you're careful and DON'T DRILL THROUGH THE TRAILER WALL !!! you'll have some "secure screw holes.....