Home is always a good choice. If on the road, a nice classy expensive hotel, will always have a clean restroom, in the lobby area. Then there's always Mcdonalds, etc.
I knew a guy , back when I worked at the Post Office, told a story of going off into the woods, taking his dump, and using his socks for toilet paper. Things can get boring on 3 hour breaks. Ironically his name was John, still is !
I swear this is true.
Doug