S O L D Built STRONG for OFF ROAD ADVENTURE. A Flat Bed Expedition Camper is a combination of both C Class and Truck camper, without the property tax of a motorhome. May also be mounted directly to chassis. Flatbed specs; my flatbed is 77.4\" wide x 84\" long. Camper is slightly wider. The height from the bed to the truck roof is 34.5\". If your bed is lower, spacers or additional sub flooring ...