Hey man- gorgeous car! I think I can give some info for ya and hope you have some use of it:
I`ve got a 1999 trans am ws6 that came with the exact same tires as your car did when new.
I have been storing this car since I bought it 8 years ago. Sometimes just for the winter months and at other times for up to two years.
It was always stored on concrete in a NON heated garage. Cars don`t need heat
Here`s what I`ve done and noticed no differences with either:
- put a tarp under the car and some out door carpet( this would be soaked in water when I would take it out beneath the car)
- I tried foam insulation under each tire.
- car jacket. Google is your friend but a car jacket zips up and over your car and you throw some moisture desiccants in it and zip it up quick. When you take it out it`s just like you left it.
Truth be told, I never had any issues with simply throwing down my tarp. Throwing down my our door carpet. Driving car over it. Tank full. Fuel stabilizer in. Battery in the basement. Done and done. Fires up on first crank no joke.
People will try to reinvent warm water for no reason. There`s no need for you to do the same. Car is beautiful. A custom car cover (cover king makes beautiful ones) and you`re golden!
So: tarp under car (optional) leave tire psi alone. I`ve never ever had flat spots. Ever. These good years aren`t like the tires built in the 70s and 80s. Full tank. Cover. Done
Sent from my iPhone using Tapatalk