Hello Dusty,
Just make sure the Knucle Dusters are CE marked and you do a full risk assessmsnt before putting then on. After all we dont want you hurting your self!
I do recall that at least one manufacture used to fit steadies that you accessed from the side of the caravan, there were two holes in the lowest portion of the side wall just where the nuts were. But there are probably two reasons why they dont do that now.
I cant remeber which manufacture it was, and it was on a pretty old caravan, but the steadies were only bolted to the floor. not the chassis as now. The floor was probably much stronger and certainly not as well insulated.
The second reason, is that many people like to store their caravan in narrow gaps, and ther would be insuficient space to use the winding handle when it sticks out to the sides.
We built and used a camping trailer, (a Mirror newspapers Barry Bucnkel special) and it had steadies that were accessed from inside the trailer. They were just a square section tube with a turn buckle screw lock. Obviously not suitabel for a heavy caravan, but it could be possible for the screw adjustment to be located inside the corners of a caravan, and to act vetically. though this might compromise some internal space or feature