I used to mow a yard for a guy using his tractor. It had a very steep hill. The riding tractor (can't remember what it was, but a typical low-end riding *lawn* tractor) was outfitted with rear chain. It worked great. Didn't scuff up the yard and really helped out with traction. The only negative was it left marks on the blacktop driveway when it got really hot. The chains stays on year-round.