I'm also interested in running radio-less as somewhat of a theft deterrent. Give less reason for trouble.
I bought an
Ultimate Ears Boom 3 in 2019:
https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1
I used it in a non insulated cab of a Ford F100, truck has 6 banger and wimpy stock exhaust; but it was also spring and I had windows down. Could barely hear it(duh lol). With windows up it was still not really worth it. Of course I could hear the song in general and the singing, but there wasn't much sound definition, I couldn't hear the little things that make songs good.
Nonetheless I wasn't satisfied with the boombox experience, however I have also driven that truck for 10 years with no radio ever, so I just shut it down and forgot about it.