Anyone remember the 5x4 twin sticks in 10 wheelers back in the 50s and 60s? That was a 5 speed with a 4 speed auxillary behind it. one arm through the steering wheel to steer and shift 5 speed and one arm on the brownie(auxillary) I used to do it so anyone can. Or, fit a double overdrive roadranger to your multifuel and move the transfer case back. It's a real lot of work but you could pull stumps and 747s, and still go fast. JT out