Vinyl when riding the car

[Electronic M]

Not in person (I may have seen the Highway HiFi once at a car show) but online. There were atleast 3 purpose made car phonos back in the day: the proprietary format Highway HiFi, that philips single play 45 unit you link to and an RCA 45 changer.

Of the 3 the RCA is IMO the most practical. It used standard 45s and could play a stack of roughly 10-20 without human intervention, meaning you didn't have to feed it a new record every 3 min like the Philips and you weren't stuck with non-standard 16RPM discs like the Highway HiFi. Also the RCA was sort of an upside-down automotive spec version of their excellent RP-168 mech so I expect it must have been quite good.
I'd love to get the hardware and compare all 3 but I'd probably have to spend a couple thousand dollars to make that happen or do a LOT more searching for them than I do.