I got the idea to build a 4WD ambulance after seeing a Unicat Terracross, but they were far too expensive. So, I did a lot of research on what would be a good donor vehicle to base my build off of. I ended up looking at older ambulances with the 7.3L turbo diesel, a true workhorse that could run on pretty much anything, and get serviced practically anywhere in the world. On top of that, ambulances have a full 2.2" thick aluminum box on the back -perfect for building off of.