I have this 2dr trailrax rack for sale. I installed it and it was on the bronco for 3 weeks. I took it off when I bought a 4dr so I have no need for it. I paid $1200 new. Asking $600.
https://trailrax.com/collections/ford-bronco/products/blem-trailrax-modular-roof-rack-for-the-ford-bronco-2-door
I have two in car seats (one in a keyfit 30 and one in a booster type) They fit just fine back there for riding around town and for school drop off. If its not the main kid car I would stick with the two door. By the way the kids love riding in the Bronco!