As an roadtrip adventurer ,planning to to be self sufficient as possible , I want a real spare with me .Now the real challenge is to mount it in a way that will : Not kill me in a otherwise survivable crash ! and Doesn't Greatly reduce cargo space .I am considering 2 storage options . 1) Cutting and molding the existing odd shaped Tub , as there appears to be some room to work with on the bumper end .(concerned that this option will change the crumple zone physics in a crash, making ME the crumple ,as the un-giving wheel is pushed forward in a rear _ender . . 2) Mounting Vertically- Not Horizontally ,Removing the plastic molded interior on the drivers side ,and Welding a threaded post to metal available , replacing the plastic ,now with the mounting post through the new custom hole. The tire standing on tread held to the side by the threaded post , I would then cut the false floor so that I could leave the tire in place while lifting the remainder up to access the storage space below . Thoughts,comments suggestions . I will be traveling with a real spare NOT ,mounted on roof rack , carried on a trailer , laying on its side in my cargo space .