I don't think a Spatched 20 pounder will fit too well in a MES 30. You do have the option too cut it in half then smoke the halves on 2 shelves. You can smoke them at any temp from 225-275°F until an IT of 150°, then finish in a 425° Oven until the IT reaches 165°. You will have crispy skin and no issues doing it this way. Put a Drip pan with some veggies under the birds and try the recipe below...JJ
Smokey Turkey Gravy
1- Lg Onion,
4-5 Carrots,
3-4 Ribs Celery
3-4 Peeled Cloves of Garlic
Toss them in a pan under the Turkey, and let the whole deal Smoke for one hour,
THEN add 4-6 Cups Chicken Broth,
1/2tsp Dry Thyme (4-5 sprigs Fresh)
1/2tsp Dry Sage (2 sprigs Fresh)
1-2 ea Bayleaf
Finish the Smoking process to the IT you want.
While the Turkey is resting, dump the pan juices, veggies and all into a 2-3Qt Sauce pot and bring the Jus to a boil, lower the heat and simmer 20-30 minutes. Strain out the veggies and let the Jus rest a minute or so for the Fat to rise. Skim off the bulk of the fat then using strips of paper towel laid on top of the Jus, quickly removed, take off the last little bit of fat.Bring the Jus back to a simmer. Mix 2T Flour and 4T Chicken Broth for each Cup of defatted Jus. Whisk together to make a Slurry with no lumps, add a little additional Broth if needed. Whisk the Slurry into the simmering Jus, bring back to a simmer and cook 5-10 minutes to cook out the flour taste and fully thicken the Gravy. Adjust the seasoning with Salt and Pepper and serve.
The purpose of Smoking the Vegetable for 1 hour before adding the Broth and Herbs is...The Smoked vegetables Roast in the Dry heat concentrating their Flavors and Sweetness giving the finished Jus a Richer, Deeper, Full Flavor.
Serve the sliced Turkey with plenty of Gravy and Enjoy...