I bought my old company truck 2002HD Extended Cab Long Bed 2wd. My wife connected it to her horse trailer and put a padlock on it so that left me without a tow rig.
So I built my own tow rig. I bought the 1972 2500 4x4 Sierra Grande from the original owner. He was using in to haul firewood for the last 10 years or so. I don't think he ever cleaned the truck since I found the receipt of when he bought the truck buried in the glove box.
He had the engine rebuilt once and converted it to run on propane. It never ran right after the conversion so he parked the truck. I found out that he never tightened down the distributor.
Here is what I started with.