In a large bowl, combine vegetables and vinaigrette. Grill pork, covered, over medium heat 4 minutes. Turn; add vegetables. Grill 4-5 minutes longer or until a thermometer inserted in pork reads 145°. Remove pork from grill; tent with foil.
Place garlic bread on grill rack, cut side up. Turn vegetables; grill, covered, over medium heat 4-6 minutes longer or until vegetables are tender, garlic bread is heated through and bottom is toasted.
Cut tenderloin and garlic bread into serving-size pieces. Serve with vegetables and, if desired, additional vinaigrette.