In the small motels paid in cash, there certainly wasn't any mention of it, but maybe being older folks who look pretty darn boring, they don't figure its an issue, especially as we show up tired and clearly wanting just to have a shower, eat and go to bed by 8 or 9.......
In Wisdom, MT (Small town) the GF and I rode up to the Nez Perce Motel. There was a sign on the office door informing that the owners were out at a family function and would return that evening. Taped to the office door were envelopes with keys to each available room. The sign said to pick a room and settle up later, which we did. Paid cash. Nice people.