Keeping Jacks Down for Storage to reduce tire flat spots

Tom/Barb wrote:

frankdamp wrote:
I left our Georgetown parked in the driveway with the jacks down the first night we owned it. There was a thin film of rust on the piston rods the next morning. That was the only time I did that!

Living across the street from a salt-water marina was probably a factor. The rust polished off with no obvious damage.

What system would not have chromed pistons in their lift cylinders