The hulls or bodies of motor homes are all very similar. They all contain fiberglass exterior walls with aluminum or steel frames in the walls and roofs. Polystyrene foam board material is used for installation. The interior walls are covered with Luan and the ceilings and roofs utilize a combination of plywood and Luan. The graphics designs on the exterior of a gas rig will usually be accomplished with decals, whereas the diesel product will have those graphics spray painted on.
Decals have a limited life when exposed to the elements.
Rubber roofs are harder to keep clean and tree branches can tear them. The diesel product will usually have fancier interiors with cabinet quality that is generally superior to that found in the gas product. This provides the diesel owner with considerably greater driving range between fuel stops. You will find larger capacities in the liquid tanks in a diesel. Storage capacity is generally bigger in a diesel vs. a comparable length gas unit.