Never though of that, but.....
I see a couple of simple ways you could accomplish this with a Fleetwood product.
Simplest way, but not as reliable. Stick a magnet on the switch that senses the door opening. This would not be the preferred method. If the magnet fell off the steps would extend.
Most reliable way, retract the steps and pull the fuse. Your chassis electrical manual should be able to tell you which fuse panel & fuse.
In theory if the steps encounter an immovable object, such as the curb, they will only go that far and stop because the spike in current draw at that point tells the controller to shut off. (But I don't want to be the one to test it with my leg.). So maybe it's not something you need to worry about.
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