[DieselDoctor]

Jonathan, I'm not arguing here, I agree with all your statements about traction but in a semi truck tandem axle with the power divider unlocked, doesn't the wheel with the least traction see the power output due the the differential in the power divider? If the power divider is locked in and the rear centers are no spins, then all four drive correct? So in the case of this project, because the back rear axle is positively driven by the shaft passing directly thru the front rear, wouldn't the back one still be driving even if the front one was totally off the ground and spinning? There is no lost motion or disconnect of the driveshaft as it passes thru the front hydro. Even so, with no suspension at least one or two of the four rear tires will most likely be off the ground most of the time on rough terrain. I think it's a cool project too and like you would like to see the OP succeed.