I purchased this boat new after seeing it at the boat show. It was ordered, but there was a lot of confusion on the options selected. in that I missed ordering a ski tow bar. I have bought one from Avalon but a bit confused on how to mount it. The front tubes will mount directly on a 'hat' Channel, but not sure where the rear tubes line up. Not getting any help from Avalon or the dealer. I think it might be about warranty. All I want is a picture of the underneath to see if the tubes mount through the 'U' Channel or just in front of the 'U' Channel.