also be aware of mice. they love to live and chew on long term stored cars. I store my car inside an attached garage so I havent had any issue. but I always flip down my sunvisers as it is a perfect perch for chewing the headliner. metal jackstands and remove the tires makes the most sense to me as it limits their access a little better, and if you can crawl under and stuff any openings with stainless steel or copper wool. car covers are a toss up for an outside stored car, they can blow in the wind and any dust that gets under will act as an abrasive.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)