standard sized turkey pots will be plenty big enough. I want to say they are in the 30 quart range. A little taller and thinner than standard pots, which is a good thing.
My 30 quart turkey pot has plenty of room for a 22 lb turkey, although I only do <15lb. birds. Seems I read somewhere that the big birds aren't adviseable. Something to do with in the danger zone too long and the bird might dry out by the time the inner parts are up to temp.
Life's a party with a Backwoods Party!