There are several ongoing threads about this. The problem is the structural beam across the rear, which is why there are TWO underfloor storage areas.I just wish they would rearrange the underfloor storage in the rear to accommodate a space-saver.
Tire issues? No auto manufacturer warrants tires. I'd NEVER got to ANY auto dealership to resolve an issue that isn't theirs! Dealerships that stock tires usually have gobs of space, equipment, and techs available for a quick and profitable tire turnaround.