Discounted to $618!!!!!:E
I can't believe how much they want for these motors/gears.
The RV manufacturer probably pays about $25-50 for these motors. Nothing complex, just a single-speed dc motor, simple gearbox, and sometimes an electric brake.
Here are some on Ebay (though not your specific part number):
Power Gear MotorsI would rig something up using a similar cheaper motor before I would ever pay that much ($600).
Or maybe a hand crank!:)
Good Luck
Steve