My daughter is 41 lbs, 4 1/2 yrs old. I am considering a high-back booster for her to ride in our second vehicle, a Dodge Ram. It has a full back seat. She might ride in it once or twice a month, I just can't justify spending two hundred dollars on a Nautilus when I know she meets the requirements of a booster. She is a well behaved girl, sits well, and I know she'll ride well and not squirm around in one. She normally rides in a Frontier (still harnessed) in our Odyssey. Just looking to spend around $50 or so for something for her to ride in the truck if need be.