I put one on mine. I just made sure that I put it in the frame of the RV.
I assumed (and was correct) that there would be a frame rail (stud) coming down just beside the door. I've never seen inside the walls of an RV but have seen the inside of LOTS of buildings, there's nearly always a support on both sides of a door (or window).
2013 Winnebago Sightseer 36V