I like that these tires fit snugly on the tires and don't come loose when the trailer is parked and the wind picks up BUT I don't like hugging the tire to reach back to attach the safety hook . It's ok now but I can't imagine hugging myself when I'm older it's gonna kill my knees! I've been wearing them for about 4 months and they stay in place well. They work? Who knows. I had 2 year old tires with separate tread and I don't think it was caused by sun exposure. I've had bad luck with rubber bands in the past, hopefully new (in the last 5 years) plastic formulations will make it elastic for a longer period of time. I gave them a 4 because they seem to be well made and the wheels didn't come off like they did on Harbor Freight.