First post here. It may have some errors.
I was looking for a SUP board stand and found this one out. It doesn't aim for boards or kayak but for Panel/windows in Auto workshops. But I find it could be used for boards or kayak as well.
PS: I got 11 foot 30 inch wide and 12.6 foot 28 wide hard SUP boards. They stand on it stable. also the foam protects any scratch when you turn boards around.