I was also looking for a truck meeting your list of specs and eventually got a 1998 Dodge Ram 2500 2 door with a 12V Cummins. It needed a new transmission, which I upgraded to Midwest Transmission Center's NV5000, a new clutch, a new harmonic balancer, coolant flush, accessory belt, water pump, rear pinion seal, front pinion seal, front axle seals, center axle disconnect repair, some body work, and a new interior. And new tires. I've almost got it 100% now, and it's great. Initially I was looking for a smaller Tacoma or the old style Tundra, but I'm glad I went with the Dodge. It's only a bit bigger but like twice as capable.