No problem, i was putting mine in a backseat of my wagon...
He sleeps like a baby, but when i removed him, what a noise :!:
Almost every time when he was 3yrs, he played with the radio and steering wheel while i was doing the car and when he get tired, i put him to the backseat and he fell to sleep...
That don't work if you ain't got the seat's... :D
Now when he's 9yrs, i can't find enough to do for him while i work the car...
Every tool which he pick up he asks: what's this and what i can do with it...