I just did a lot a research looking at the various forums and ended up getting the barker 3500 for my Edge M21. The shaft is 2 1/4 inches and it comes with the large foot. They have a 3000, but the shaft is only 2 inches. Best price I found was some outfit in NY State that advertised on ebay. Works like a champ, takes about ten minutes to install. All you need is a couple of jack stands, a wrench and electrical tools to put a terminal connector on the end of the wire. Basically, raise trailer, insert jackstands, lower trailer on jackstands, remove old one, install new one, hook up electrical, raise trailer, remove jack stands and lower trailer to desired height. I would advise ordering the vinyl cover for it (about 20 bucks) at least here in TX because the sun will eat up the plastic housing.