Moving bunks are okay on a trailer with hinged bunks or rollers designed for that purpose, but I wouldn't leave any bolts loose as they will just cause unstable bunks, and the nuts could rattle off. I've had good luck using galvanized lag bolts, applied with double nuts tightened against one another. I also apply thick waterproof green grease to the entire thread surface beforehand, which seems to last years in the water and prevent it from ever rusting. Cold dipped galvanized bolts will last longer in a wood bunk than stainless steel, as stainless steel fails to be stainless in a wet and salty low oxygen environment- instead it corrodes rapidly (sodium ion crevice corrosion). If the bunks don't currently match up to the hull, you could modify the bunk support posts to make them match up better. Tyler ----- Original Message ----- From: "Rich Makela" <richmak@makelaperformance.com> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Sunday, August 23, 2015 12:05:14 PM Subject: M_Boats: M-17 Trailer Bunks I am re-carpeting and generally refurbishing the bunks on my 1977 vintage M-17 trailer. The bolts that attach the bunks to the posts are badly rusted and a bit loose. Should the bunks be firmly anchored to the posts, or should they be allowed to rock sideways a bit to match up with the hull? Rich Makela M-17 #233 - Harmony