Bulge in fresh water tank

[2 for Him]

I was running a new wire for 12v to the rear of the 2955 and noticed the white water tank, though strapped, had a very large bow in the bottom. I do travel with 10-20 gals of fresh water, might not any more.
Has anyone else looked at their fresh tank? Maybe it is supposed to be a low spot for the drain or pickup?
Thanks

[gcrocket]

When I was working under my 2955RL this winter I noticed the strapping on the water tank but don't see much bulge. See my picture of the tank and compare with yours.
http://tinyurl.com/6dt3huz

[2 for Him]

Thanks GCrocket,
Looks like I need to pull my hitch and underbelly an brace/ support mine somehow. Mine is bulged down at least 2 inches between the straps.

[2 for Him]

Update,
Well I pulled the hitch, stabalizers and underbelly yesterday. The problem was the third 1 1/2" strap brace that was supposed to be in the center if the tank was never screwed in and had slipped towards the driver side about 1/3 of the way. Since the tank had sort of moleded itself to the strap i cut another out of some of scrap steel angle iron and put in a fourth brace. Secured both and discovered why my fresh water drain took so long, the hole in the underbelly wasn't lined up with the drain outlet on the tank and the hose had a major kink. Easy enough to fix with a snip. Only one more project before our long trip, a hailstorm beat our old awning apart, already had one but was being lazy 'til fall, guess I get to try another job I learned how to do on this forum.