The wall studs are only aluminum, and not that thick. As long as you hit the studs with the correct RV self tappers and in enough locations it should work.
Finding the studs will be the challenge. You "may" be able to get a one page blueprint from Heartland of your walls.
Stud finders really do not work all that well, but may help narrow down the area.
Cool nights, damp mornings and the sun coming up. Look at the side of the trailer and you will see a roadmap of every stud and cross brace, marked by the morning dew.