Of course, in that case, the best solution would be a trunk-mounted MP3 changer, not an empeg. What would be cool is if the empeg guys make a trunk-mounted MP3 changer for just this scenario. Hmm!

They HAVE a trunk mounted unit prototype gathering dust on the shelf. See here
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup