Baked potatoes in a smoker are the pork butts of the vegetable world: they take WAY longer than expected, especially if you're used to an oven. Time is your friend. I wash, poke 4 times, coat with oil, sprinkle with coarse salt, and throw on the smoker, no foil. The skin gets crunchy and the inside fluffy, but a baked potato at 300F will take 3-4 hours to finish, possibly longer. I've actually had baked potatoes take longer than an 18 lb turkey to finish when loaded at the same time.