Bonless Pork Loin Rub
From the loin, comes the most tender bites the pig has to offer. Some of the selections coming from the loin are: Tenderloin, center-cut pork chops, crown roasts, butterfly chops, country-style spare ribs and lots of other tender cuts.
Personally, I would mix :
2 Tbsp. salt
1 Tbsp. garlic powder
1 Tbsp. onion powder
1 tsp. thyme
1 tsp. ground bay leaf
1 tsp. fresh ground black pepper
You will find the meat much more tender and juicy if you cook it only to 145 degrees then let it rest for 10 minutes before slicing.
Also, I wouldn't punch a hole in a pork loin for a rotisserie. I cook them often and they do very well just sitting still.