Ken,
This seems to work better on pieces than whole chickens, so this should work for your thighs.
I brine the chickens for a long time; about 20-24 hours. Simple brine; for 2 gallons of water, about 1 cup kosher salt, and 1.5 cups sugar.
After the long brine, rinse, and pat dry with (lots of) paper towels. I rub them with Weber's Beer Can Chicken seasoning and let them sit at room temp. for about 1 hour
I smoke them low, about 225 for 2.5-3 hours for wings, 3+ hours for legs. I'm guessing your thighs would be more like 3+ hours. The wings come out better than the legs for me, but I LOVE wings.
Oh, my fuel is Royal Oak lump, and I use 2-3 chunks of oak, with a dash of oak chips as soon as the meat goes on. No basting, no high heat, no spraying. Don't lift the cover for the first 2 hours. I do put water in the pan.
The meat is so juicy, the last time I had a wing spritz juice out when I grabbed it with tongs. The skin is similar to rotiserie. Niiice blend of sweet, salty, and smokey.