But for off road, nothing beats a dozer. Here's the world's largest - twice the size of a D-11.
And yes, the one in front is about the size of a D-3, just for comparison. The big one moves 90 cubic yards of dirt with the blade, and has an operating weight of over 300,000 pounds.
Why did you kill this car, and the whole F-Body platform GM?!?! ARRGGHH!!!