Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
As Oldschool indicated, you need a higher heat to get a crisp skin. Thighs can handle the high temps. Also, I have noticed that when I brine chickens I tend to not get as crispy a skin as non brined birds. Again, thighs can survive not being brined as dark meat doesn't tend to dry out as much as white meat. I usually pull back the skin on the thighs, apply a rub or seasonings, sprinkle some rub on the skin and smoke them at about 325-350. Tender and delicious with a crispy skin.