I had to change my tire for the first time last week. Who thought it was a good idea to use a freakin donut? Anyway I was looking for a full size spare. Called hind a and they told me I can't store it under the back. The manual seemed to say otherwise. It seems like you can browsing through the forums. I was want I g to make sure. I also have 18 inch wheels and heard I could use 17s. Is this correct? Thanks for your help.