I wonder if it's different for the Quad cab vs the Crew Cab? I know the Crew Cab feels much larger on the inside, but I am not sure if it's all additional legroom, or if the Crew Cab gets larger rear seats too?
That said, I had a Quad Cab as a work vehicle for awhile and it worked fine with the rear-facing child seat my son was in at the time. It was uncomfortable for adults though.