do you really need rollers at the ramp you use? Its rare to see roller trailers down here, most are aluminum I beam with 2X6(horizontal) bunks on brackets. the biggerboats use the big solid wood bunks, but they down't support the boat as well and can cause the trailer to float when you put it in deep. You're supposed to cut the bunks to fit the hull, but no one ever does. Nice thing about carperted bunks is the boat will sit on them with out moving too much while you secure the winch strap, so you won't have to keep the motor in gear to hold the boat. Float on trailers used to have a hoop and latch sytem so the boat would hook itself
http://www.floaton.com/features.html. While you're down here, you can talk t my trailer guy in Mt P and see what he says