Holy sagging water tanks, Batman!
Since I was already having a venting problem with my FW tank, I decided this weekend to look and see why there seemed to be a bulge in my enclosed underbelly. The venting problem was a pretty simp...
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Mine started to flex or bow when my drain valve got hit by something kicked up from the tire and started to leak. The leak got the 3/8" plywood wet and lose it's strength. My rig also had 3 metal straps under the flexing plywood. When I took the plywood out there were all sorts of construction leftovers between the plywood and the water tank. I replaced mine with 3/4" plywood and everything is working just fine- so far.
