I went to the link, and yes, that should work fine for one yak. Max capacity is 250 lbs and that's plenty. I saw some deluxe and expensive p/u truck racks made by Thule that mount on each of the rails with bars that go all the way across. For one yak, that ladder rack will accomplish the same job for less $$. A few of my local surf buddies who are carpenters/builders just haul their boards and other toys on their over-cab ladder racks. Lots of yakkers use some kind of "saddles" on their crossbars to better hold the yak hull. Without saddles, you can probably haul your SOT lashed on upside down. My U-12 goes on upside down. I already had some old Yakima saddles that I use for my Tarpon 140, so it rides deck up, but I think I could get that on upside down without 'em. In your original post, you also mentioned storage. Always store poly hulls out of the sun. I keep mine locked up in my garage. 303 is good sunscreen for the hull, if you are car-topping it in hot-sunny weather any distance. UV eventually breaks down the polyethylene over the years if you leave 'em in the sun.