2014 Windjammer 3001W Holding tank leak (overflow)

[Pops_]

Water leaks from the underbelly when the grey water tank is full. I had expected the water to backup into the shower and was trying to learn how much it would take after 4 lights show full.
Is there an overflow vent?

Water leaks from my fresh water tank when it is full and the trailer rocks from side to side. The water gets inside and runs out onto the floor from under the cabinet near the hot water heater. I pumped the tank down to half full and watched the level for many days to insure it was not the check valve.
Is there an overflow provision for the fresh water tank? If not how would one know when to stop filling the tank?

I have seen several posting of similar leaks but for different reasons. I started this thread to seen if anyone else has had the problem and to let others know.

Pops_

[caper]

We had a leak near our HW tank since day one. Could not find the source of the leak. This year replaced the tank and there was a bad weld on the fitting for the pressure relief valve. The funny part was the tank would only leak when we were taking showers. Always thought the shower stall was leaking. Since installing new tank no more leaks.