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