dude i agree with bimma85 on this one as i've seen this happen. you are illegally parked i.e. not in a space lol. if you are illegally parked it'll probably come down to a 50/50 at fault. then again, if his tahoe only has a small scratch on it, talk to him see if he'd rather not take it to insurance just in case it is his fault. you might get out lucky and only have to pay outta pocket, instead of paying outta pocket, getting points on your insurance and having your rate's go up.