About 1990 we installed two truck wash machines in a two bay building. One was friction and the other was an EARLY touchfree. The owners had a crew to prep the trucks and trailers in both bays. Since this was an early touchfree the chemicals weren't what they are today. Both machines got to be labor intensive. The friction machine wouldn't handle the contors of conventional tractors and the touchfree just didn't clean. The wash was located right next to a large truck stop. Now the building is all closed up. I'm not sure if the machines are still inside or not.
I think if retail truck washes worked you wouldn't have to be asking about them.
Footnote: The salesman brought a prospective customer in to see the wash before it was programmed. Yup, pulled the mirrors off and caved in both
doors of the tractor.
They didn't buy one!! Trust me, it wasn't the machine's fault.