Skid Row Joe wrote:
I have rust on my unit's frame from just visiting a few days most Winters Up North. I don't know when it becomes a problem though. Same with my Mercedes-Benz autos. A couple weeks most every Winter up North, and bits of rust show wherever bare metal is. It's part of the North Country Winters.
Never experienced life north of the mason Dixon line, eh?
Short answer, find something else to worry about. And if you can’t, a couple rattle cans of gloss black will make your perceived potential issue disappear from your purview.
Otherwise, it’ll be fine either way. the frame and structure will outlast you.