Christopher, I think you might run into trouble with those ribs if you try to do them at 300 degrees. That's an okay temperature for the turkey (you want to get that to about 165 in the breast, and about 10 degrees hotter in the thigh/leg), and you should get there in about 3 hours or so, depending on the size of the turkey etc. The ribs could seize up on you if you go that hot. My idea if you need to have these things come off around the same time: do your ribs at about 225 - 250 for 3 hours, take them out, foil them, and finish them in your oven at 225. After you take out your ribs, stoke up the temp to 300 - 325 in your weber, and throw that turkey on. The turkeys turn out great in the smoker, and they're really easy to do. Good luck!