Stir together brown sugar, sugar, black pepper, salt, ginger, garlic powder, onion salt, dry mustard, crushed red pepper, ground red pepper, cumin, paprika and thyme in small bowl. Heat oven to 325 degrees F. Sprinkle 1/2 cup of the brown sugar mixture* evenly on all sides of the pork roast; use your fingers to rub into pork. Place roast on rack in shallow roasting pan. Roast, uncovered, until internal temperature is 150 degrees F., 40 minutes to 1 hour.
Remove from oven. Cover with foil; let stand 15 minutes before slicing.