You can add a drip pan if your UDS has a lower grate, or just let it drip onto the fire.
How do you manage the fat that falls from the butts while they are cooking?
I trim all of the 'hard' fat - the fat cap. Butt is very marbled so I never hesitate to trim fat, and still get a juicy product.
I don't foil, rather I wait out the 'stall' which occurs at around 150 meat temp, and again I think at around 188. Waiting until it gets to 190 - 195 is (I think) important.
Pulled Pork is very doable and the UDS is great for it. I leave 16 hours for the cook, and have a Stoker temperature controller so I can get some sleep !
Thanks for the great info. Picked up a 6# Butt for my first cook in my new drum this Sunday. What are the pros and cons of wrapping with foil?