As Pakey said, they have cars that seat six (three benches per car). The only way you might be in trouble is if you don't have an ADR and are trying to walk-up. They often seat non-ADR groups at the picnic tables in the back, but I've always been told that ADR guests get priority for car tables. Still I would make sure to ask when you check-in if you can be seated together in one car. I don't think you need to, but there is no harm in asking.