Do yall think it would be safe to move my Fullsize spare from under my car to my expedition roof rack.I have the 18 inch SE rims on 255/60/r18's and not sure if it would be safe to use rachet straps. This LR does see 60mph + speeds almost everyday and hope that i can run 75mph + with the tire up their. Has anyone else mounted their spares on roof rack with no problems.