There was an in depth reveal of a Expedition style 3500 SRW TC on Truck Camper Adventure that used that space for two spare tires (secured with a pair of sturdy fold to the side brackets) using a short bed TC on a long bed and using the space where the factory spare used to be for an aux fuel tank. It did have a custom bed though with side cabinets and slots to roll the tires out to the side. An interesting set up with no wasted space using a factory 4-season Lance 825 and no roof top AC. The couple live and travel in it, full time.
jefe
