There should be studs on all walls, probably more in the exterior walls. Use a stud finder to locate them then aa small drill bit to verify the location before sending a screw thru the wallpaper. Remember to use short screws as the walls are pretty thin.
2013 26BH ghetto model w/ 4 plain rims and some rust
2001 Silverado 2500HD 6.0 gasser
I have a fever...and the only cure is more camping!