I think you will struggle to fit everything in a Grand Am or any other mid size. If you joined EC make the reservation for a full size with Emerald Aisle service. I think the rate for a full size is usually the same as mid size (or just a couple dollars more). If there is something bigger on EA you can take it. However, you are only guaranteed what you reserve so I make the ressie for a full size. That is what we have done for our Nov trip. Myself, DW, DD, DS, 9 days, double stroller and luggage.