The unimog is a wonderful truck... if you live in Europe. It has attachments! Even a backhoe.
Unimog owners like to brag how they pull humvees out of the mud.
It has a geared wheel hub (so the axles are way up, but top speed is 50mph)

I would make one for america, but there are things i haven't found a good solution for...
like tires. Those tractor tires are great... if you are on the farm. Shitty if you need to drive interstate. Which you do a lot of out in the fly over states. So, what kind of tires? And that basically decides the rest of the truck.