Hello, I am looking to live full time in my bus. I started out looking at 4x4 vans to have the ability to go off the beaten path. Then I turned my search to a van based short bus. As I intend to drive quite a bit I wanted to go with a diesel for economy and power. I researched the 7.3 extensively and wasn't happy with the possibilities and maintenance cost. After more research I discovered the Dt466 mechanical engine and had been leaning towards something bigger. Have been looking at 30', but now I may go 40'. Is the 30' much more fuel efficient to make it worth the space you give up? I am single so I don't need to worry about anyone but myself. I am wishing to build something that I can stay out two weeks at a time before resupplying.