There are some Rudy's in Armadillo--er Amarillo. They're a chain, but I enjoyed the food...I was jonesin' for Q! They generally have good reviews, and they have long brick pits with heavy steel lids. There are 2 in Albuquerque, too.
http://www.rudys.com/SearchResults.aspx?q=allI just went to Google Maps, zoomed down I-40, hit the "what's here" link, typed in Barbecue, now wherever I move down I-40, the map fills with BBQ joints. Looks like you can throw a rock in OK City and hit 3 Q joints on the bounces...Ft. Smith AR is historic for 30s gangsters...read Elmore James'
The Kid to get an idea...
Here's just one of the places along I-40 in Arkansas...
http://www.yelp.com/biz/pudgy-pig-b-b-q-russellvilleWhew. I just spent the last half hour cruising around the US with barbeque joints popping up wherever I moved the maps. Pretty fun.