Hey You-
Just thought I should tell you what I have seen at my father's automotive shop. We work on taxi fleets and personal cars around town. Someone was complaining that there back wheels were locked, next thing you know here comes the vehicle on a tow truck. My father being the man that he is, hops in the truck, pulls and pops the park release a few times and then puts it into gear. The wheels are still locked mind you and then, then, it pops and unsticks. Yes, the emergency brake was stuck, I guess this happens sometimes. Do keep seeking answers, just thought you might want to hear my thoughts. Sarah V. Peace-Out