Rub lightly with some vegetable oil. Press your choice of rub into oil coating. I like SPOG with a little dark brown sugar added. Most fruit woods work on pork loin for me. Cook to 150 internal temperature, then cover in foil for 10 to 15 minutes. Should be faintly pink, done to medium. A lot of people are still afraid of pink pork. Use an instant read thermometer . 145 med rare, 150 medium, 160 why bother.
For an interesting side dish or accompaniment, I serve canned apple pie filling in small ramekins. Chop the apple slices into small pieces, serve warm like a dipping sauce for the pork.