I do the same as Tail Gate Joe.
I use the same technique. Wrap in foil.
Served brisket samples for 3600 this past weekend using this.
SPG and and a little chili powder. The beef has so much flavor, your rub does not need to be elaborate.
2 - WSM 18.5, 1 - WSM 22.5, and 1 - ECB Smoke n Pit.