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Why not create a self proplelling bed with wheels? It could have a small electric motor with a joystick to control movement. Wheels could be large enough to go up stairs. It would not have to go fast, only at walking speed. Also, it could tilt up so could see where you were going.
||Isn't this the whole idea behind those little motorized scooters that old people always run over my feet with?
||Presumably capable of running off a small 1.5 volt watch battery too?