Sounds like an awesome camper! And how great to get the savings by buying something "used," that's only been used 5 times!!
We got one of the little Thetford Porta-Pottis from Walmart, and I have to say, I'm glad we have it. We always stay places with "facilities" too, but it sure is nice not to have to go there when I wake up in the middle of the night! Ours has only ever been used for, shall-we-say, "liquid waste," so it's not hard to keep clean. Anyway, you may want to look into getting one if you or your family members tend to wake up in the night needing the bathroom!
Enjoy your new toy!!