I have seen photos taken of various brands of camper that the fresh water tank has fell out of for whatever reason.
Since it apparently does happen at time, I checked mine. The cross braces are secured with self tapping screws. As a precaution, I got 4 more pieces of angle iron similar to what the factory used, and spaced them between the factory braces so not have double the number of supports under the tank.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.