KYFLYGUY:
DO I do a dry seasoning to this or just the vinegar mop only? or both?
I would do a dry rub on the butts with no mop. If you want you can add some when you pull the pork. Since this is your first one I would try some with and without the mop to see what you like.
It is 15 degrees here so I guess I'm lookin at 2hrs a pound at 225 or go to 250?
I like to cook at 225 and as Smokin says "Its done when its done" each piece of meat is different. I would alot 2hr a lb to cook but start checking after about 1 and 1/2 hours a lb based on the largest piece and pull at 190-200. They will easily hold for several hours if done early. The cooker is so insulated that after the inital warm up the temp outside should not make much of a difference.
Good luck and remeber it is usually safer and much more fun to experiment first before having to perform for the hungry crowds