Step into the time machine and meet a legend: the Freightliner Powerliner. In an era of 300-horsepower trucks, this monster came from the factory with options like a 12V71 Detroit, a 3408 CAT, or the mythical 600-horsepower Cummins KTA. These were heavy haul engines stuffed into a highway truck, and they were glorious beasts. They were also cramped, incredibly heavy on the front axle, and got about 3 miles to the gallon. It was the kind of truck a driver had to be careful with, unless he wanted