Oops. I just remembered that there's an outpost of this
local barbeque operation in Alexandria, Virginia specifically:

Rocklands Barbeque & Grilling Company
25 South Quaker Lane, 703-778-9663
I always think of D.C. (and their Wisconsin Avenue,
NW location) when I think of Rocklands but the above
noted Alexandria location (off of Duke Street) is supposed
to be good sized (the D.C. location is very small) as it hosts
the more than two-decade old barbeque company's catering
operations. (I've only been to the D.C. location but, indeed,
very good Q!.) 
P.S. Did the Generous George's (pizza) -- now in Herndon,
Virginia -- close its Duke Street location in Alexandria (just a
stone's throw from the aforementioned Rocklands)?