I was boat judge in a tournament, 2 foot shock tube, 2nd skier off the dock put the handle in the boat. I told driver to get back to the dock and got the 4 foot tube from my boat. 2 foot tube is useless in my opinion. 4 foot may not stop/redirect everything but much safer than any other options. I love the Performance and Radar products, a great design.
Cheers
Ali