The Camper Body is a Service Body that is specially designed for use with a slide in camper. This allows for a great deal of storage for trip essentials while keeping the camper uncluttered. There is one company who has been building them for over 50 years: Douglass Truck Bodies. Here's some words from their website:
The Douglass Camper Body is custom built to your camper's specifications, creating an interlocking fit while leaving you with the utmost storage space possible. Our sales and design teams work closely together to take into account all your equipment needs, from integrated spare tire holders and mechanic's drawers to inveters and rescue winches.
Every Douglass Truck Body comes formed from A60 Galvannealed Steel, with double-panel doors, double-seal weatherstripping, stainless-steel hardware, ¾” split-tube reinforced wheel wells, a high-visibility LED tail-light package, and PPG Del-Fleet Essential high solid polyurethane primer and paint.
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Commercial Truck Success www.comtrk.com or www.commercialtrucksuccess.com