6.4L Engine Issues - Dead at 8166 miles

So we just got our 23’ GW 6.4L in August. Engine is locked up at 8166 miles. Dealership won’t know the extent until they dive into it. Happened while my wife was crossing a highway. Thank God she made it across and coasted to the shoulder. We had roadside assistance and that was a pain in the ass dealing with the towing company wanting to be paid on the spot over $500.(We didn’t have to pay since we used Wagoneer services.) Second Jeep in a row. Not impressed. Definitely not luxury quality.