Back in the dark ages when hay was square baled, granny gear, a hand throttle, and a couple of bungee cords on the steering wheel got a lot of flatbed trucks loaded. Point the rig in the right direction, lock the steering wheel straight ahead, and idle the engine up a little, then join the crew bucking bales until the truck got to the end of the hayfield. Turn it around, "rinse and repeat"! A thousand bales a day or so, baled, picked up, hauled, and stacked in the barn was about average, working from "can see to can't see"!
Jerry