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I installed a couple of 2x2 angle irons across the frame using 2 self tapping bolts on each side then using wood blocks between the metal and coroplast pushing the blocks snug up against the tank. There are 2 braces already under the rv and with the additional braces you have 4 that when blocked up snug is enough to keep the tanks from flexing. I made sure my tanks were empty so I could get the blocks tight enough so that when added weight to the tanks they would not have enough to expand downward. I drilled small holes in the braces and used short screws through the angle into the blocks so they wouldn't shift. The metal braces used were able to brace both gray and black tanks and has worked very well.
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