I converted the 5" by 40" rear roller supports, to carpeted bunks on the trailer for my 1960 Thompson Seacoaster. A few of the old rollers (remember gray Maytag wringer washer rollers)had broken, and the hull was supported uevenly. Also, according to a boat shop I consulted, the keel rollers were supporting too much of the boat's weight. He said that the weight should be spread beteen the bow (Knee), and the two rear bunks. He indicated that the center rollers were there mainly to guide the boat and that I should be able to spin them by hand with a little effort. Per his recomendation, I gradually lowered the center rollers, and then put 400+ lbs of sandbags, and barbell weights on plywood sheets along the inner keel, and over a period of several months, the structure settled down nicely to a more straightened condition, for and aft. However, I still have a slight crowning in the center, port to starboard. Not at the stern, but around front seat/windshield position. I am now thinking, that the keel has probably settled as much as it is going to, but perhaps the lack of support on the sides at the wideest point over 44 years, has caused the boat to become a bit 'jowly'.. I think it would be smart to add a pair of short (2 ft)carpeted bunks on the front also, but I would just as soon find something premade to bolt on my Tee-Nee trailer. Has anyone seen some sort of U shaped tubular support having bunkboards at the top, that I could bolt on my trailer?
I am doing so many other projects (like flipping this boat over in the next couple weeks to work on the bottom), I don't particularly want to design somethng myself.