I saw a guy on our lake from a distance with his boards on top. I did not like the board on the outside, they were just too hard to get to and I am too cheap to buy spinner racks, so I decided to try it out.

I moved them mid summer last year and had no problems with boards moving, I really like the ability to stand on the motor cover and access the boards. I have them set as far apart as I can in the crossmember. My boards are 142, 138, 135 and 128, and they all ride fine in the racks. Without the bimini deployed you can get dripped on, and if you forget to empty the boot before you put it up there you can get a surprise.