This may be a question with no answer. I have a 2004 Forest River Cardinal 32 ft fifth wheel. It has a built-in radio / cassette deck connected to four speakers on the ceiling. I would love to be able to connect my macbook to the radio and get music out the four speakers. (It would be the most luxurious music experience I've ever had.) I don't plan on selling the trailer, and if I do, perhaps the new owner would also like their music in luxury. So I'm ok with alterations to the radio. Is there a simple way to do this? I'm heavily techno-challenged, but I have a dear friend who absolutely can't stand to admit to failure, so he'll give it his best. Thanks for your help!