Here is my method. It may not win any BBQ competition awards, but I find it to be a very simple process that does not take time for extra steps that others use.
0. Preheat grill to 275° before pulling pork shoulder out of the fridge.
1. Pat dry with paper towel and apply rub right out of fridge without a "glue" (like mustard, olive oil, worcestershire, etc.)
2. Place on preheated grill at 275° immediately after applying rub.
3. When internal temp hits 160° wrap in foil.
4. Continue to cook until internal temp is 203° or probe tender.
5. Place in a large enough aluminum pan to pull.
6. Unwrap shoulder in the aluminum pan, let juices fall into pan, and begin to pull with forks immediately after pulling from the grill removing any fat and gristle you do not want.
7. Mix some additional rub into the pulled meat.
8. Eat
Alternatively, I have gone to this method lately.
0. Preheat grill to 275° before pulling pork shoulder out of the fridge.
1. Pat dry with paper towel and apply rub right out of fridge without a "glue" (like mustard, olive oil, worcestershire, etc.)
2. Place on preheated grill at 275° immediately after applying rub.
3. When internal temp hits 160° place in large foil pan and pour in 2-3 beers and cover the pan with foil.
4. Continue to cook until internal temp is 203° or probe tender.
5. Remove from grill, remove foil, and begin to pull with forks immediately after pulling from the grill removing any fat and gristle you do not want.
6. Pour off excess juices
7. Mix some additional rub into the pulled meat.
8. Eat