sambot: The M1010 looks like a good option, although they are notoriously difficult to get your hands on, from what I've discovered in a few hours googling.
Petrolburner: The F350 Box Truck option sounds good. I've also been looking around and finding aluminum ambulance boxes that could mount to an F350/450/550 4x4 chassis as a fast way to get what I want with minimum interior build work necessary. I know that to add that sort of weight is probably going to require some modifications to the suspension, however. A standard 4x4 box/cube van is also a great idea given the interior height. Additionally, I've seen F350s with an aluminum flatbed in place of the in other
Art4med: The ambulance is the Class 1 van style, it's only about 5'7" internally, which is horrible for someone my height for any length of time. I also had to completely gut mine because the interior was in such bad condition, so I'm back to bare metal and looking at a complete refit. Happy to do the work if it's warranted, but it's a long way from my ideal solution.
I've also been seeing some interesting conversions done on step vans recently, with the same benefits as a box van - all aluminum construction, interior height, compact width and length. No chance of putting a 4x4 on it given the center of gravity, of course.
