I was also thinking the same thing recently. I've got a spare 24v 5.9 cummins. Like you I had thought about the generator idea, but 235 hp is a lot of kW!
Another idea I had was to build a tracked off road vehicle of some sort. Maybe either use hydrostatic drives on each track, like a tracked skid steer, or maybe use the motor to power a big electric motor on each track? Definitely not cheap ideas, but fun to imagine nonetheless.