I'm wondering about coal capacity? Sure you could fit 2 butts on it but would you have to reload mid cook? My 18.5 can maintain approximately 250*F 16 hours with an outdoor temp of 65 +. That's using about 12 lbs of KBB.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen