Create the marinade by mixing apple juice, warm honey, pork rub, brown sugar, chopped thyme, and black pepper in a large bowl.
Add the pork tenderloins to the marinade, turning to coat.
Cover the bowl with plastic wrap and put it in the fridge. Marinate the pork tenderloins for 2-3 hours.
Preheat your Z Grills pellet smoker to 225 ˚F.
Place marinated pork tenderloins directly on grill grates.
Smoke pork until the internal temperature reaches 145 ˚F. It will take about 2 ½ to 3 hours.
Once the internal temperature rises to 145 ˚F, remove pork tenderloins from the grill.
Allow them to rest for 5 minutes before slicing and serving.