Neil, not to take anything away from your fine post, tuff when people hit your extended steps
, I just want to add the bolt on gear plate that moves the actuator arm for moving steps is a soft bolt it will snap off if step hits a curb, or from a heavy person entering coach many times. Do use step support when camping.
My bolt broke on trip and had to tie up steps until CG stop. I replaced bolt with a 1/2"x2" stainless steel bolt. Old bolt head will pop out of drive plate, had to file down head of new bolt so it would glide in between gear plate and step mounting plate. The old bolt head had teeth in the head that grip the plate, used a lock washer and nylon lock nut to hold new bolt in place on plate.
The new bolt works just great if steps hit something on contact, curbs, etc, the actuator arm will brake, soft metal, but steps will not collape if someone heavy uses the steps. A safety facter in my case.
Thanks for your info Neil.