"Are you sure about those weights? Not quite apples to apples but a built up three piece 70-ton roller bearing truck with truck mounted cylinders and 34" wheels weighs 8,500-9,000 pounds (I have the exact weight somewhere). 50-ton trucks are 750-1,000 pounds less while 100-ton trucks on 1,000-1,500 pounds more."

Heavy enough to squash a Terminator, though this takes place well after the era of this list. ;)