Title pretty much sums it up! DD was 4 in Feb. and is about 37 pounds. I don't know her exact torso measurement, but she's a bit taller than average. She normally rides harnessed in a Nautilus in my car. We have a 1998 Dodge Ram truck with a bench seat in back that we use sparingly for trips to our lake lot, etc. (less than 10 minute drive). That is really the only time she's in that vehicle. I have 2 extra Nautilus seats, but the bench is too shallow for them to be installed properly ... they overhang a little bit. Soooo ... I'm looking for a seat for her with either a shallower base, or one that is ok to overhang. Also, being it's used so infrequently, I don't want to spend much. I was leaning towards a Maestro, but we live in a rural area and have found nowhere to see one in person, and I understand that once the harness is outgrown, so is the booster portion. I also thought about a HBB, as she is good at sitting still and it will be used so little, but that thought kind of makes my stomach knot up (even though she will be 4.5 this summer)! Suggestions? I've tried searching the forums, but still unsure. Thanks!