Electric steps for RV that did not come with them

I've looked into this, and will be doing this mod soon.

The power steps are not an issue, but the controls will be a job..

switch button in the door jamb
Switch on the wall
signal from the ignition switch
Power to the steps.

All pretty straight forward, but running the circuits will be a pain.

Also, the wire harness for the steps is sold separately, so you'll need to research that, too.