My 14 tin boat has rollers going down the middle and bunks on the rear. the rollers are adjusted just high enough to allow easy rolling on the trailer. I use lots of dirt ramps where there is sometimes only 8" of water sometimes at low with a 10 plus foot tide. Not sure that is what you are talking about but figured I would just say. You can adjust the rollers higher to take more of the weight of the boat which should add to easy of retrieval and launch.
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