John,
       When planning senior tours, yes the rest room stops are most important, even though we have one on board the coach as well. We research the route and all facilities along it carefully, with that thought in mind. The mens room is not that much of a problem but the line at the ladies room forms rather quickly. That is because 80% of our travelling seniors are female and mostly widows looking for company. We try to stop at least once every 100 miles for this purpose as well as for a coffee break. I remember many times having to commandeer the mens room and temporarily turn it into a ladies room at some establishments.
                                           SOL