I wonder if you could use the pins to take a wrap, then go around a pin and wrap the other way, so as to prevent rope twist while lowering?
Right off the bat, I am leery of all those little spikes sticking out of the drum.
Maybe they help to avoid overlapping of the rope on the drum?
Looks simple enough. I'm a bit skeptical of hitch-anchored rope brakes. I'm waiting for the picture of a log suspended in mid air, dude holding the rope, and the back tires 2' off the ground!
Convenient idea, though.
Looks like someone went a little overboard with the welder to me. Big time overkill. Not to take away from the person who made it.