We came upon our first major problem. The first time Don went to empty the black tank, the handle on the gate valve came off in his hand. Now we know why the tank was dry and empty. No one could use it!
We went to Camping World, picked up a safety valve for the end of the main outlet (we did this for Lucy, too) and a new valve to replace the broken one at the tank. We will have to wait until we get a full hook up site to be able to fix that. There's videos on Youtube how to deal with it. In the meantime we're back to using our trusty porta-potty which has saved us on more than one ocassion.