I have purchased the MacGregor 26 trailer guides from the local MacGregor dealer for $75 for the set (pair) for my M17. Unlike a lot of MacGregor parts, these "goal posts" are very strong and are almost an exact fit for the M17. I will post a picture when I get a chance. Note-Mounting requires drilling (4) clearance holes for 5/8" bolts. A little beyond the capabilities of most cordless drills! Secondly, I plan on adding keel guides as a secondary measure. Sometimes when winching the boat on the trailer when I have it too far in the water, the bunks bias on one of the lap strakes and it gets loaded slightly off center. It is simple to re-float and re-center with it winched up, but the keel guides would be foolproof. As a sidebar, EZ Loader Trailers are quite incredible (self centering roller bunks). I have seen boats come onto the trailer almost sideways and get centered correctly. Unfortunately, local experience had been that they also are easy Unloaders as well as several boats have been dumped on the launch ramp or freeway because of casual tie downs or lack of safety straps. Steve Shenkel <>< _/) M 17 263 Arizona