Agree Cooper anchor is a great choice I use one too. I also have found that a drift sock clipped on the tow loop in the back with about 5 feet of line and the front of the ski tied to dock also with about 5 feet of line does a great job of keeping the ski away from the dock and banging the dock when rocked by wakes from passing boats. I ride in a river so I have the current to pull and also use a friends private dock so it might not work in all situations for everyone but if your able it seems to be the ticket considering the spark and docks aren't the best of friends.