Outside storage for 3-5 years....

The absolute worst is gravel or dirt.
No offense but people in .CA, TX, and similar dry states probably don't realize what we are up against in "rusty" states.

the worst here is to park them in the weeds/tall grass. Heavy morning dew will not dry out under the car because of no air or sun. In short time brake lines, fuel lines start to rust. then floors, trunk, and frame.