Would a child who is on the 3rd position up from the bottom in a parkway sgl still fit in one? (I'm pretty sure she's in the 3rd, not the 4th, but I'm going to check soon!) I'm considering putting dd in a harness for a massive road trip this summer, but she has a super long torso. I don't have a measurement but I've tried the radian and she's even or just above the top slots. I know they say it can be used above the slots, but that's a lot of money to spend on a seat for such little use as we have no younger children to pass it down to. I really don't want to spring for a frontier for this trip, either, since she does fine in her booster. I guess I'm just looking for a little more piece of mind that she will stay seated for the entire trip. We haven't done a road trip with her in a booster before.