I co-signed for my lil sis and that debt is considered to be mine as well as hers. Each time I have my credit run her car is figured in to my score. I would recomend not to do it. I will never do it again.
I put mine on just for a fix-it ticket inspection with some kite string and the cops said good enough. It simply has to be up there on the nose. They don't care how its mounted.