cooking pork in a slow cooker is not a good idea. you need a smoker or at the very least a wood chip tray for your gas grill, but thats a pain. i recommend the weber smokey mountain. my buddy has one of these and it works really well too:
https://www.walmart.com/ip/Pit-Boss...w-Flame-Broiler-and-Meat-Probe/160692525
