Yep, its a military surplus tow bar, suitable for a deuce and a half.
Flat towing something so large and old is not easy and for sure not for everyone. There are a bunch of safer ways to move a truck.
Tim's truck towed well, but I had near 13,000 lb leading it down the road, plenty of HP and excellent disc brakes from a medium duty truck. We kept up at 60-65 mph. It was still a long drive.
Also drained the water out of the rear axle, and removed, cleaned, repacked with grease, and added some lucas oil additive to the rear wheel bearings.
Grigg