I do have one of these,
http://www.basspro.com/Dometic-Porta...3080707464215/
But I had already packed one of these:
http://www.basspro.com/Luggable-Loo-...product/45412/
With nine people there, I knew there may be a line at times!
Good tip for the TP for the road. On the Pacific side, there were very nice gas stations. One even had shower!