To answer the coming question: I used a Bandera smoker for 4 of them, utilizing El Diablo natural mesquite charcol with mesquite chunks add to help with the smoke, and my electric Masterbilt for one of them, smoked with mesquite chips.
Cook temperature 225 degrees. Pulled them out of the Bandera between 4 and 5 hours, put in an aluminum chaffing pan with beef broth added, covered, and cooked at 225 in the household oven. The 5th was cooked all the way in the Masterbilt, being foiled at 4.5 hours, broth added.
Cook time ranged from 9.5 hours for the shortest, to 13.5 for the longest.
All briskets were packers purchased at Sam's Club.
Regards, Riz58 Char Broil Akorn, Bandera, and Masterbuilt Electric Smoker