A mobile version of Z-Burger is expected to hit the road next week!  They have entered the mobile vending lottery and have the following assigned spots for January 2015:

Monday: Union Station
Tuesday: L’Enfant Plaza
Wednesday: Farragut Sq
Thursday: Franklin Sq
Friday: wildcard

I’ll update with more info as I get it, including menu details! In the mean time, check out the write-up in the Washington Post.