Upgrading my 2013 7x18 to stiffen the center fresh water support i removed. Although the screws were tight for all 3 straps, the center support sagged in the middle more than 2 inches with just 1/4 tank. So i removed it and installed a 36 inch long set of parallel support bars across tank width to support the entire tank bottom between the other 2 supports that didnt sag much being near the tank ends. Also ordered a 2-5/8th inch dexter lift kit for both axles that ill put on next week to give me more offroad clearance since i boondock when atv riding. I also built a 15 gal fresh water ABS pipe loop for the roofrack on my 4Runner for warm showers when i boondock.