Originally Posted by MSHappyCampers
Hi ! Welcome to IRV2! We're sure glad you joined the gang!
If that's some type of handicap lift they I think you would need to anchor it to studs, not just through the wall.
Good luck, happy trails, and God bless!
When I installed mine in my TT a few years ago, there was a cabinet against the wall so I opened up the inside of the cabinet and reinforced the wall with unfinished plywood inside the cabinet. It sounds like your's isn't concealed so, if it's not mounting to studs, you could fashion a backing board (3/4" plywood) that will look nice next to your cabinet, stained to match, routed edges, etc. One edge of the backing board can probably be secured to the studs along your door. Since a backing board will be necessary one way or the other, you can go ahead and drill or cut a hole in the wall to check things out. The backing board will cover the hole. If you cut your bolts to the right length, you can secure them with acorn nuts for a more finished look.
If you really don't want to make a hole big enough to look through easily, you can get an inexpensive "endoscope" that will work with a smartphone, tablet or laptop. They're very useful and not that expensive (the cheaper units should be fine for this purpose, just make sure it has LED lighting):
If you have any other questions, feel free to PM me. I've had a lot of experience with, not only the Handy Lift but with accessibility in general. You've made a good choice with the Handy Lift, it works well.