I joke that DD will be sitting in the backseat until she gets married. I'd check with either your car manufacturer or DOT(?) and find out what the height/weight requirements are for your vehicle.
"You know I was talking to my friend Desdemona the other day she
runs this space station and bake shop down near Boomtown. She told
me that human beings are flawed individuals. The cosmic bakers
took us out of the oven a little too early. And that's the
reason we're as crazy as we are and I believe it." Jimmy Buffet, Fruitcakes, 1994