Abstract: The invention relates to a wheeled trailer support device for use with a slip-in camper which is engaged to the box of a pickup truck. The invention enables an individual to use a slip-in camper of extended length with a standard sized box of a pickup truck. The invention includes a platform having an engagement face which slides along a friction plate which is mounted to the underside of the slip-in camper. The towing arm of the invention permits the trailer to track a curved road while simultaneously supporting the extended length of the slip-in camper. Separation of the wheeled trailer support device from the underside of slip-in camper is thereby eliminated. Wear upon a trailer and/or trailer tires is simultaneously minimized.