When I replaced the CrapperTone Unit with a residential unit it came with a IPod dock.
Both of my sons were very happy but it was short lived.
There was no way I was pulling the trailer for 3 hours each way just to listen to their music when we got there.
You might try e-bay or craigs list. Maybe someone there might give you a few bucks for it.
2009 Flagstaff 8528 RKSS
2007 Toyota Tundra DC 5.7L V8
Pullrite Superglide 14K
Air Lift 5000
Prodigy Brake Controller
"I've got a mind like a steele.. a......a steele......um.....uh...... what's that thing called again?