I like the idea of ropes, I'm sorry lines, going from the bow to the forks and from from the stern to the forks. One long and one short with carabiners. You could have the kayaks on the floor in your building and drive the forks over the top. Hook up both lines on both kayaks. Get back on the tractor and raise the forks lifting both kayaks. I realize that the kayaks are 11' long but almost half of that will be under the forks. I like this idea so much I think I will try it with my kayaks.