The vehicle's VIN number should be on the vehicle dash on the driver's side (lower left dash on the inside). You should be able to see it from the outside looking inside. It is required of all vehicles to have a VIN(vehicle identification number). As far as motor home number/model, you should have a listing of all of the serial numbers/models of systems used in your build by Thor stuck on a wall usually inside a closet on the wall.
Paul
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