Need to stack a bunch of boards on your car? Kayak ‘stackers’ allow a way to do so more safely than just securing them to your surf rack,…
http://stokemagazine.blogspot.com/2012/03/using-kayak-stack-racks-for-sups.html
excellent impartial review
I find it AMAZING that there is only company making stackers.
PS - For the dense - I find it amazing that Rob chose not to mention other companies making similar attachments. I suspect he is partial to Yakima due to, probably, a pro-deal.