Fresh Water Tank Leak?

[Howie]

I have a 2005 seabreeze 1321, ford chassis
I was filling the fresh water tank with the garden hose on full pressure, when it was full (I let it run too long) water came out of the overflow hose. Now when I park on a angle leanining to the right rear, alot of water comes out (1/3 of the tank)
Could I have cracked the tank?
If it is cracked can it be fixed or replaced?
It looks like a major job to get it out or even inspect it.
Help wanted
Thank you

[Dunner]

If it's like mine, there is a built in regulator/restrictor where you hook up the fill hose. The over-flow on mine is on the left rear. I've heard of other brands siphoning water out when full. Sure hope, for your wallet, that it is not cracked. National built a great coach. I love my 1311. My buddy has a 8321, on a Workhorse, with a floor plan like yours.

If you need any documents, hints, tips, etc, let me know.