You don't need a semi trailer pushing the tractor through intersections, so fix the brakes on the towing unit.

3176 like in the 75 is also used in semi tractors. I found a compressor at a truck salvage yard and also the necessary stuff to make an air-brake system. My farthest hauls from bin to elevator is 4 miles. My farthest field to binsite is 3.5 miles. That field to elevator would be about 7 miles but I never haul direct from field to elevator anymore.