It's more about gears and torque than HP. I've run 435 HP to 550 HP that all put out 1850 torque. I always run a 4.56 rear and an auxiliary behind a 15 or an 18. Getting around isn't horrible bad, there's just some places you can't go. With a 30' deck we were 134' long. Backing with that particular trailer wasn't too bad. It wasn't full steerable but we had awesome bump steer and with the right tillerman you could get around pretty good backwards. Assuming the driver knew how to back with a jeep. I stuck that pig in some tight places with 40' in the well. Won a steak dinner off a project manager in GA as a matter of fact. Also, we ran 50-55 mph tops. It takes a lot of fuel to run any faster with a small rig let alone one with 50 tires on the ground and lord knows what catching wind. It's a whole different segment of trucking. About the only similarities are the DOT man. Usually we were so wide or heavy they couldn't weigh us on a fixed scale. Some states met us at the line, did an inspection and weighed us. Some didn't seem to care as long as they stuck us for the high dollar permits.