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Gentleman,
Thanks for your suggestions. The boat goes off the trailer fine without dunking the hubs in the water. It's the retrieve thats getting old like me. The bunks are just loose so there is no particular drag on them and the keel rollers are about 3" dia at the centers. It's just winding that thing back up the slope. People dunk the whole trailer and float boats back on. But I get enough rust to deal with keeping the hubs out of the water.