Issues?
Flat spots developing on the tires from sitting in the same rotation position for 9 months.
Rodents chewing hoses and wire insulation, colonizing your vehicle.
Find someone, even if you have to pay them, to drive your Tesla vehicle every couple of weeks. Park in a different parking space if possible so that rodents don't assume it is unoccupied. Also, the scent of humans is a natural repellent to some animals.
If you leave the Tesla plugged in the Mobile Connector can be chewed by rodents, other critters. There is even one account of a raccoon chewing up, damaging the Mobile Connector chassis. I'm not saying that this will happen just be aware of the risk.