Your buddy should check and see if the inside system has a place to connect another set of speakers. If not, putting in a switch to select between the inside or outside speakers shouldn't be too difficult to rig up. It might be easier to put a boom box in the compartment and bring it out when he wants it, that way he'd have volume control. He could also use an iPad or iPhone with wireless Bluetooth speakers to play audio. Lots of choices, just keep the volume down so it doesn't bother the neighboring campsites. (Had a bad experience once, someone decided everyone wanted to listen to a comedy album at a loud enough rate it could be heard 100 yards around his campsite --- until the manager asked him to leave.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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