ALL truck campers ,Basic construction,truck tie downs info.

I am visual guy and I can understand everything much faster when seeing pictures.
I just did repairs on 2 campers and when I agree that front wall is very important, can't see how rear door affects it?
Than my 2 campers do have different frames.
On Fleetwood, doing rookie mistake in 1st season- I "tried to lift truck" with camper jacks.
The frame holding the tie under slide bent pretty bad.
But being it aluminium, back home I was able to jack it up to make it straight again.
Wood would simply broke.