I used the perfect rib recipe that TN Q used. I smoked mine at 180*, the last one I let go until an internal temp of 132* and then let rest wrap in double foil for 1 hr. I then seared at 550* in my oven for 10 minutes.
I like to let the smoker prewarm before putting in the prime rib.
I gotta say, I've never ate a better prime rib in my life.
Smokin's Prime rib is a must read. He has recipes on how to make Au Jus in there also.