>>686699I'm 6 foot, 190 pounds. I sit in an 11.5' kayak just fine. A better seat would be nice, but there are plenty of aftermarket options to choose from.
>>687865In a sit on top, you will get wet, but its very hard to tip. You could get slammed by a wave coming over the kayak and knocked off, but realistically you probably don't wanna be out in a kayak in those conditions anyway. Dress for immersion. Wear a proper wetsuit if the water is cold (under 60 degrees). Keep a dry bag with a towel and warm clothes and prepare for the worst.
>>687870Obviously use ratcheting straps. Use 12' straps or so. Lay the kayak across the racks. Loop the strap under the rack on one side. Toss both ends over the kayak. Loop under the rack, and ratchet tightly. Wrap up and secure the excess strap. Repeat for the other rack. For the front and back, loop a strap through the handle of the kayak and secure somewhere near the front bumper/under the car. Same for the rear. For the front/back straps, I use straps with a hook. Hook one end to the handle, one end to somewhere secure on the car, ratchet tight, and secure the excess.
When you're done, shake the kayak. The whole car should move with it and the kayak should not slide around freely. Also, dont bend the kayak by strapping over tightly in the front and back.