*Updated* Fresh Water tank fell off while driving

Our 60 gal fresh water tank came from the factory with 3 thin straps and 3/8" plywood under the tank. The plywood was supported by the same "L" brackets that the tank edges sat on. Developed a leak at the drain connection one trip and when the plywood got wet the straps stretched and the tank sagged heavily from the weight of the full tank.

Our fix was to replace the thin plywood with 3/4" subfloor exterior plywood and tightened up the straps.