I do this during winter to minimize my exposure to the Wisconsin elements. I usually take it to wrap stage on the WSM at 225°F (3-4 hours), seal then into the bath for 24 hours at 170°F. When I pull it out of the bag, I give it some time under the broiler (or one time, a propane torch) to firm the bark.
I've also done baby backs in the bath. The results were spectacular.