I have put 40lbs of pork butt onto a single rack in my uds. The times increases a little bit, but not much if you are able to recover to the temperature you want to cook at quickly.
What are the sizes of the butts and what temperature do you plan on cooking at?
Sublime Smoke Barbecue
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Want to meet some others with the obsession of BBQ? Clicky for the planning of the Virginia/Mid-Atlantic Brethren Bash