This is what we've done, so we don't really have to deal with the radio & adding a receiver behind the dash.
Above the radio there's a docking station that we can move from one of our cars to the rig when we go camping. That way we can enjoy it all the time without having to keep two subscriptions.
Below the dash are two additional speakers we had installed. The roof-mounted ones were pitiful. They can be easily unplugged and moved out of the way if we need to get into the doghouse.
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