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.
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)
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