Which hbb's fit short, chunky kids well? We hear so much about what fits skinny kids well and I never had any trouble picking boosters for my oldest skinny child. My middle child is 4yo and rides harnessed 100% in a SK400/radian/nautilus, but it got me to thinking ahead about booster training and all that with Pre-K starting soon. So I sat him in every booster seat we have and the lap belt was always a little high on his tummy, like the lower belt guides need to be out farther. Best fit was in the HBTB, which in my own non-tech opinion was okay, but not great. So he could thin out a little, but are there any "known" HBB's for chunky kids?