Heat charcoal or gas grill to medium; spray grates with nonstick cooking spray. Grill tenderloins until internal temperature reaches 150 degrees, turning occasionally, about 20 minutes.
Brush both sides of potato slices with oil; grill 15-20 minutes until just tender, turning occasionally. Remove potatoes and pork from grill.
Top potatoes with cheese, sour cream, and onions. Serve with tenderloins cut into 1/4-inch-thick slices.
All materials courtesy of Family Features. To help make this a successful grilling season, visit www.smithfield.com/meal-ideas for more tips and recipes.