Chalet with a rotted basement floor

Thanks to all of you that offered thoughts and suggestions to my problem. I've been able to see into the area that holds the tanks and yes, there is mold under my fresh water tank. Still not able to locate the source. I'm now planning to cut an opening into the front area and see what shows up there. I've talked with Bill Penny and he suggests that I add some straps under the "belly" to hold everything in place. I called the factory several times this past week and left many messages. No one returned my calls.
I'll continue to search for causes, put together a plan for fixing, and then replace the floor.
At this time, I'm not sure what level of support I'll get from Chalet.
I'll keep you posted.
Thanks again, Larry.