If the camper is on the truck: Take the measurement from the face of the rear bumper on the pickup to the outside edge of the bumper on the camper, as shown in the following diagram.
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If the camper is not mounted on the pickup, follow these three steps:
- Measure inside the truck bed, from the front inside of the bed to the outside face of the rear bumper.
- Measure the camper's overall floor length, including the rubber bumpers on the front, to the outside edge of the bumper on the rear.
- Subtract the two figures: the difference between them is the length of the extension you need.
