Looking to transport more than one kayak or canoe on your next paddling trip? Look no further. Rhino-Rack has developed an extension piece that attaches to one of our current kayak and canoe racks (S512) and allows you to add another watercraft. Take 2x S512 and 2x extension pieces and if your roof rack crossbar is long enough, you can mount up to 4 kayaks or canoes on the roof of your vehicle!