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I know that Hummer offers a backup sensor that goes in the reciever hitch. I'm not sure if it hooks to the radio or what but I think it is around $400 and since Hummer is a GM it might be compatible with your Sub.
 

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So here is the scoop on the Hummer (possibly GM???) Backup sensor. It plugs into the Rec. Hitch and plugs into the trailor light adaptor(power). It then has a little reciever module that plugs into a cigaret lighter and beeps as you approach an object. The one I know of says Hummer on it but I'm sure that they make them for other vehicles or just plain. We put ours on with a locking pin of course so they can't just be taken out. (common sense I know but it never hurts to say):rolleyes:
 
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