Thanks so much for the replies, everyone! Paulj, thanks for the exact roads! That makes me much more confident! I didn't realize that you could see street views on google maps without an exact address. Neither of the picture you sent looked bad. The back road in California we were on had the white line on the edge of the road crumbling off into the drop-off below with curves and steep hills and no guard rails. Those pictures don't look bad. Thanks!
Yes, those are our exact stops. We tend to go places and stay a week, branching out from the location to see sights, and then making major drives on the weekend. The only one I'm wondering that might be pushing the limit is Alder Lake to Priest Lake. Maybe we'd need an overnight in a rest area. Have you done that? Thanks so much for the help!
Old guy - I might be a bit like your daughter. I'm glad you're not. And my husband's not. Maybe what I should do is purposely fall asleep and not think about it!