I have a 2170 that I purchased back in 2006. The trailer had the four bunks but the forward bunks would burn the hull ( rub the gel-coat and paint off ). If you seldom use your boat, it probably would not be an issue, but mine is used about three or four times a week. I was directed to contact Don at Starline which I did and took it to him. We discussed it and he replaced the forward bunks with keel rest...I think all the trailers are built like this now...I could be wrong though. Well, this worked fine for a short time but it has taken its toll on the keel over time and is pretty banged up. I have had it worked on twice and just have not done it again....tired of spending the money. I tried a keelguard which works fine, but over time..it pulled off...I spoke to them and they said that they do not recommend boat applications for trailers that have a keel rest....basically, it cant withstand the friction from the weight ( in such a small area ) when unloading and loading. Has anyone went back to the bunks after using the keel rest?? And if so, what has worked for you?? Im reluctant to take it back to Starline....I was told that this would solve the issue, which it did not. Im not sure what else they can do. Don was pretty much at a loss on what else that could be done. A friend of mine has a Kenner and our hull are basically the same...His trailer is a drive on and does not skuff his hull...The design is pretty good too..but I dont think the starline can be done the same. Any suggestions...??? I love my boat and hate to see it getting banged up at the launch.