Design a great trip, it's in your hands.,
Wekcome to the Great American Roadtrip Forum.
Thanks for your contribution sharing your experiences.
In 2009 I did a five month trip in a Dodge Caravan, with the rear seats removed and a camping mattress in the back, along with sleeping bag and pillow. Many nights were spent at truck stops, but there are areas where truck stops are not readily available. The publication to which I referred (above) lists those which make RVs welcome. State Parks and BLM campgrounds are good alternatives, interspersed with the ocasional motel. Any well maintained vehicle with 80K on the clock would be eminently suited for a road trip. Mine is going on twice that much.
I have seen many other vehicles on the road converted to allow sleeping. Mostly mini vans, but even sedans with the rear seat removed. If you can't sleep lying down comfortably, sleeping in a vehicle is not recommended. My travels these days are in a conversion van with a bed and fridge as well as some storage. It is a comfortable way to travel, and as you would well know, showers and laundry facilities are available at truck stops, and lots of other places.
Like you, I like to travel without necessarily setting a destination for the day, stopping as the mood takes me. With good maps in hand I then decide where my next day will take me. So just head for the horizon and go see what is on the other side. Suprises await!
Lifey