The ram is a gas engine.  Might get a diesel retrofit from Edison.  If you're truck has solid axles     

I think the tax man would be after you Strong Farmer, Dyded fuel is for off road use only, your tractor is exempt for road travel, all others are not.

If it is a diesel generator and since generator don't drive wheels, dyed diesel could be used.  That would be a huge plus for farmers, ranchers contractors etc that have fuel 👌.  weak point is battery's and control module. Diesel generator is heavy especially since they are talking about. Not sure how much pay load truck would have left. Between batteries and generator might not be much.   

True but if that internal combustion engine is only running a fraction of the time that is the savings.  How much heat gets pushed out the tailpipe and rad in an internal combustion engine.  Also its a small naturally aspirated 6 cylinder motor (presumably de-tuned for efficiency and reliability).  No turbos to crap out and 2 cylinders less than a v8.  You get the benefits of electric (torque, instant power, quiet, etc) without the range anxiety.  Diesel electric is not new tech.  Been used in rail and mining for decades successfully.  Time will tell, but I think this idea has merit.

Every time that you change energy from one to another - there is loss, typically shows up as heat.   So you will lose energy at the gen set, likely at the battery, at the power amp, and again at the wheel motor(s).     .