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Buy a set of junk wheels and tires and store the car on those and don't worry about it.
I got a set of wagon wheels with well used tires with early 2000's date codes. They are perfect to put on the car during the winter season when my nice wheels get squirreled away in the cellar so they sit in constant temperature away from exhaust as well. I paid under $250 for a set of (4) which is well under your price. Plus, it gives me flexibility if I decide to ever sell the car, I can sell my nice wheels separately.
My 91 camaro has i think 325's low profile on 18x10's in the back. They always flat spot so it's stored in the air on jack stands, front on the subframe so the suspension is unloaded, rears on the LCA's. The vette i haven't had an issue with yet, so the run flats get over inflated to 45-50 lbs and parked. Both batteries disconnected, enclosed non dryer vented garage covered. Its interesting a couple posts up about the exhaust. I was told running the car introduces moisture due to condensation between the engine and exhaust warming against the cold temps so i just leave mine off. First thing I do though in the spring is an oil change.Camaro is already in the air so it goes first. Between the cost of synthetic and the labor, the vette goes for a drive and i let someone else deal with it - but they're cool and let me in the shop so i visually inspect the entire underside while it's on the lift. Works out well.
Buy a set of junk wheels and tires and store the car on those and don't worry about it.
I got a set of wagon wheels with well used tires with early 2000's date codes. They are perfect to put on the car during the winter season when my nice wheels get squirreled away in the cellar so they sit in constant temperature away from exhaust as well. I paid under $250 for a set of (4) which is well under your price. Plus, it gives me flexibility if I decide to ever sell the car, I can sell my nice wheels separately.
I've been storing various cars during the winter, for close to 40 years. Whenever possible, this is also something that I've done.