I used this block and tackle to pull a 3,000 pound car onto a trailer. One person could not accomplish this by pulling on the rope by himself, but I think two could have. I had to steer the car... With me steering and my helper on my small lawn tractor we were able to easily pull the car onto the trailer. The system worked perfectly! It did what an expensive electric winch could do.
I will now take this block and tackle with me to the track in case the car cannot get on the trailer under its own power. The four star rating is because I don't know how well it will hold up. The axle pins are a fairly small diameter and it looks to be anodized aluminum turning on the plated steel pin. There is nothing to keep dust and dirt out.