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Don't own a lang either but do have a custom made reverse flow stick burner... I loaded mine up FULL of ribs once... What I want to warn you about is... Air Flow ... If you pack it full like I did I had a really hard time getting it up to temp... Had to run with the firebox door open some for awhile trying to get temps up... Just wanted to put that out there ...
I have a 84 not the 48 but I put 49 butts on it and it handled it like doing 2 butts. In fact I have done 48 and 49 on mine. Not the same size but a Lang is a Lang
The best thing about chicken dark meat is.... it's inexpensive, it's very forgiving, and it likes higher internal temps into the 190°s. Why not slightly overbuy then stagger your starting times so you have different finish times?
I would have some aluminum pans handy so you can cover (with some butter + broth) and hold in a cooler zone in your smoker.