After Seger agreed to sell the use of his song to Chevy I saw an interview with him and read another one in Rolling Stone.  He is proud of what he did and compared it to a great social act - that he was actually helping Chevy workers, because if Chevy kept selling vehicles, well, golly, then Chevy would keep hiring people to make those vehicles.  (I guess this sort of thinking would be the same if Ted Nugent sold music to defense related industries he could say, "Hm, I should sell the rights to "Cat Scratch Fever" to Lockheed because if our country keeps starting wars, then we will be sure to keep people employed to fight those wars and by making more war materials.")

Then he went on to compare it John Mellencamp and what he does for Farm Aid every year.  He actually said the two acts were the same. 

(On "Like a Rock", I'm just glad that I have a stronger mental image of my own when I hear that song, instead of picturing some Chevy truck plowing through mud in a erotically masculine nature).