They all fit! Quick story - shortly after we found out that I was pregnant, Jeremy found his dream truck. I was so worried that we wouldn't be able to fit 2 car seats and a booster, but he told me he measured and tested it, and we would be fine. So I skeptically said he could get it - and was extremely worried that if we bought a truck, it would mean that I would have twins for sure! I was wrong - no twins and no problem fitting all the kids in the back!