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I removed my cracked mats and installed dri-dek under my tanks so they wouln't get nasty. There is no lip, but I installed blocks of starboard on the front back and sides. The tanks don't move at all. The bungee as said before is only to keep it from bouncing up. Imo there is no way a bungee isn't adequate. A cam lock strap is a great idea too though. Keeping the tanks in the boat is very important. I will post pics of my instalation when the boat is finished.