We always have full fresh water tank 46, then another 28 in aquatainer jugs. We dry camp only so the holding tanks are full on the way home too. Over highways, interstate, then mountain back roads that are sometimes very rough. I have yet to have any sort of issue and hopefully it stays that way.
I do not mean this in a sarcastic way, but to me it's like asking if I ever leave home with batteries fully charged...I never new people left without full fresh water tank as well as fully charged batteries. In summary, fill everything and go watch your race, you should be just fine.