Chrysler minivan boat rack arrangement
I find it essential to secure at least the bows of the boats to eliminate lateral bounce. I use a short bungee cord to make a convenient loop for the string.
This is a simple rack my son and I built in a few hours. The cost of materials
was under $50. It holds 6 singles, but we had to space the racks liberally so that
the boats could overlap with boats on existing shelves.
I would use larger sized casters, and maybe three of them. The floor in that club
was smooth, so it is not a problem, but may help in your case.
Thanks for your interest!
Or you could build a rack in your garage.