"Just Read and Run Baby!"
I have an 18' NRS boat with the Icce Cool 205 q. cooler I use in the canyon. It sits above the frame probably 8 inches and I've been using 12" oar towers for all of my trips. I stand when I row and need the height of the towers for better rowing geometry. Oar towers are made of beefy material and I haven't had an issue yet. On my one flip in Bedrock the oar tower did take a hit but the result was just a slipping of the set screws.