texasdoc

You most definitely need the crew cab. Child seats, particularly the convertible type you have to use rear facing until the child is at least two (it's safer to go a lot longer) take up a LOT of fore-aft room. Even in a crew cab some of the child seats will hit the back of the front seats. Plus, you have way more room to load the kid. I live in Texas, which has a climate much like Florida, and I don't think you'll use the 4wd much. On the other hand, you'll use the extra room in the crew cab every day and be glad you have it.