The seats on my Old Town Camper squeaked a lot. The seats on my Nova Craft Prospector squeak some too. Doesn't seem to make a difference whether the seats are caned or webbed with cord. Both boats came with similar seat hangers. The OT has drilled dowels and the NC uses drilled rectangular sticks.
My MR Malecite does not squeak at all, and neither does the Penobscot that I made new seats and hangers for. The kneeling thwart that I installed in the Prospector also does not squeak. The difference seems to be the "truss-style" seat hangers in those. They are stiffer and limit flexing and shifting at the junction of wood to gunn'l.
Wall Mount Boat Racks