Go buy Interstate 60 on DVD. It's an independent film by BTTF co-writer and producer Bob Gale, and is one of those gems that no one's ever heard of because of a distribution snafu that left it fated to be direct-to-video. There's an element of time travel to it, and it's even got cameos by Michael J. Fox and Christopher Lloyd.
Seriously, just go watch it, and then come back here and try to tell me that it wouldn't make a great universe for a Telltale series. The movie's full title is even Interstate 60: Episodes of the Road.