Considering the light weight construction and atachment of the RV roof ladder, here is what I did.
I have a body man, Used to fix chariots for Moses when they got banged up (Ok, perhaps he has not been in business quite that long but he started back about the time I started...breathing) I had him make me a couple of "J" hooks, he made 'em out of diamond plate bumper metal Two lags in each of them into good solid wood under the rear cap hold them and they hold my 300+ (I rigged a stirrup to test with) no problem at all, I could bounce on the rope.
A shower safety/assist bar (Bath isle at Lowes) down around my eye level (About a rung above the bottom of the convertable ladder I got when my dad died) keeps the bottom of said ladder from banging into the motor home and allows me to secure it with a bicycle lock.
The ladder is like a 14.5' Extension or 8' step (Two modes).
As a roof ladder.. I would much rather climb an extension ladder than a wall mounted ladder.
As a step ladder handy for wash and wax.
Holds my 300+ easily without problems (Rated at 250 tested to 500)
I mean it is very strong.. Properly mounted you can still run up it as a wall ladder too. But I don't.
Home is where I park it!