Fresh water problem with water overflow while being towed

It would be interesting to know the brand of trailer that people experience this problem and whether or not it has the traditional gravity fill or the type system that Lynnmor has and displays in his link. Lynmoor and I have the same trailer, I have the gravity fill and he has the console system. I never leak water and he always did (until he did his mod). I think KZ went back to the type fill that I have so a little more info from those with the issue would be very informative.