I am looking to upgrade to 18"x9" wheels/tires from the stock 18"x8s on my Ecoboost. However, I do not put them on/take off myself. I take them to the tire store and they do it for me (due to disability limitations). However, my concerns are that I will not be able to transfer them to and from inside my Mustang in one go. Right now, I can squeeze all four wheels/tires into the trunk with the rear seats down. One goes in the passenger front seat, too. But, with the extra width I am concerned. Any help? Thanks.