In an earlier life I used to deploy the m870 trailer with a M123 ten ton alone all the time. My tractor's winch would run without your hand on the air valve that controlled the movement of the captstan so you used the transfer lever to start and stop tohe truck while the winch ran. Pay out 3-4 feet of cable, mover the tractor ahead to take out the slack and repeat until trailer was on ground. It was easier to recover the trailer as you positioned tractor 3-4 feet in front, attached winch cable, started winching in while you rode the brake on the tractor lightly to keep slack out of cable. Winch tractor under trailer. If trailer had a moveable load on it such as a bulldozer tht would have to be on the rear end of trailer to raise or lower it.