Infiniti has no specs on who can safely sit in the center seat of the third row of my suv. there is plenty of room for a third person to sit in that space -- and there is a center seatbelt standard on this vehicle... however, there is no headrest. i'm hoping you have info on height and weight requirements for who can safely sit in that seat without risk of whiplash or other neck injury in case of sudden stops. thank you!