I’m in the UK - We have a 2 year old and a 4.5 year old both in rear facing Swedish car seats. It was cramped in the front of my old Kia Ceed, so we replaced it with a Honda CRV, which is on the the large end of mid sized SUVs. We carted the car seats into several other cars until we found one we liked where the car seats fit. Andcdotally I have seen middle income parents almost exclusively go for SUV’s or MPVs rather than hatchbacks or estates.