Oregon Revised Statutes Oregon Vehicle Code § 801.180

(1) Has a floor;

(2) Is designed to be mounted upon a motor vehicle;

(3) Is not permanently attached to a motor vehicle upon which it is mounted;

(4) Is designed to provide facilities for human habitation or for camping;

(5) Is six feet or more in overall length;

(6) Is five and one-half feet or more in height from floor to ceiling at any point; and

(7) Has no more than one axle designed to support a portion of the weight of the camper.