I read some time back that Dodge was working with the military for a TC truck that would have power generation ability. Suppossedly it would have batteries, and could operate on the batteries in "quiet mode".
Suppossedly, they were looking at a takeoff on the idea for a construction work truck. I have no details to back that up though. I think it was in a magazine that got thrown out long ago.
It is a cool idea though... But, it's kinda like having a pto generator on a tractor; your putting hours on your regular engine...