I have been unemployed now for 9 months and am at the point where I cannot afford to make the payments on my 2007 GMC truck. If it is repossesed, what happens to my credit rating? The truck is in like new condition, with 13 of 60 payments made.

If you leased the car, you should look into Getting out of the lease early. A repossession will impact your credit rating, but to what degree is hard to say. You should try to avoid that if possible.