I bought one of the Monster Tower Cargo Rakcs last fall, but haven't installed it yet.

http://shop.monstertower.com/p-103-c...ck-bimini.aspx

I've put the top together and was impressed with the aluminum frame and canvas cover. The functionality appears to be very similar to the Z5 Cargo. The Monster rack will fit on the OBV's. The only thing I'm not wild about is that the brackets have to be screwed to the tower. Only reason that bothers me is that I think I'm going to want to take the bimini with me if I ever sell this boat and I don't know what I'd do with the holes in the tower.