The present invention relates to an anti-theft system for a camper. The camper is supported at its front end by a pair of spaced-apart jacks. The system includes a barrier having a first end operatively connecting to a first one of the jacks and a second end opposite thereof. The second end of the barrier operatively connects to a second one of the jacks. The barrier extends in a horizontal direction and is positioned and configured to prevent an unauthorized vehicle from passing underneath the camper and mounting of the camper onto the vehicle.