I am looking at a 3 person towable tube. It measures 66 x 60 (product is called the big bubba). Any suggestions on how to carry this on the boat. I can tow it in the water once out on the main lake but at some point I know I'll need to carry it onboard. Strapping it on the back I am concerned about rear visibility and keeping it secure at speed. Any pictures of large tubes being carried. I have a 2250 RCW