Road America does not have potable water for you to fill at. There are 2 dumps onsite one is inside the track and you need to have a pass to get to it and the other one is down in the carousel camping area. Just be careful crossing the bridge it is not very wide and if someone starts coming the other way and is not paying attention (and drives into your lane) you can get pinned against the side of the bridge.
Thankfully the only damage was to the awning of the trailer and not the side or the TV.
There is also a dump at the BP on 57 just south of Plymouth that is easy in and out and I now use all the time.