I would NOT recommend foam blocks for carrying water craft (canoe/kayak). Once you strap them down, all of the downward force is on an unsupported part of the roof. The roof racks that mount to the rails (I had the generic SportRack pup camper rack on mine too) put all the weight over the stronger side wall of the roof (full wood support).
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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