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Two pair of bunks works very well if you can get them adjusted right. The center pair can be fairly close to the keel, providing a guide for the bow as you load the boat on the trailer. The center pair usually cover the forward half of the trailer only. With a well-placed 4-bunk setup rollers are unnecessary although you can have one roller on the rearmost crossmember if it makes you feel better. My last boat's custom trailer had this configuration. It was sweet, especially for a boat with a 23 degree deadrise.