Special equipment: rotisserie rod
Preheat the grill to medium-high. Brush the chickens with oil and season the outside and cavities with salt and pepper. Skewer the chickens onto the rotisserie rod and grill, on the rotisserie, for 30 to 35 minutes, or until the chicken is golden brown and just cooked through. Remove from grill and let rest for 10 minutes before serving.