The best cover I have seen is the Rankin cover. It goes around the boat about where the rub rail is, and all the straps are in back. You can tow with it. It doesn't cover as much as the stock cover, which covers almost to the waterline. THere is a separate cover for the swim platform with the stock cover.
Call Phill Dill boats in TX, they had a few new covers left that they were selling cheap not too long ago.