The Post’s staff has determined the best barbecue in the area. If you trust their tastes, then Rockland’s in Glover Park is the place to go. Though the Post likes Rockland’s BBQ, it wasn’t a fan of the choice and quality of its side offerings. The Post also picked The Rib Pit on upper 14th Street (at Randolph Street) in Petworth as “the real thing” with top notch BBQ (dry, overcooked but not mushy,…