Picking a family SUV involves a lot more than counting seats. You are thinking about car seat configurations, whether teenagers can actually stretch out in the third row, how cargo space changes when you have a stroller and a week's worth of luggage in the mix, and whether the vehicle handles school pickup lines as well as it handles a long highway drive. Chevrolet's SUV lineup covers an unusually wide range of family situations, from the efficient and practical Equinox to the commanding presence of the Suburban. This guide breaks down which model makes sense for which kind…