do like one of the girls on cumminsforum did...

12v 6BT in a 2nd gen ram 1500 4x4

she kept the motor stock and tuned the pump a bit for fuel economy, but swapped the axles and complete drivetrain from a 2500 cummins donor truck.

 

Weight: approx. 975 lbs, 905 lbs dry.

Get some 2wd Diesel springs and I'd bet a 2wd could handle it