Right now mine had a real thick coat of shop dusk on it, over spray, welding soot, grinding, and ash from the wood stove covering it. The underside has a layer of surface rust because of the snow that gets drug into the shop then melting and exaperating underneath it. AND people keep leaning crap against it, or putting stuff on the roof. I came into the shop after taking a week off (when i brought my son home) and there was an extension cord coiled up on the engine, used hydraulic hoses on the back dripping oil, and hydraulic cylinders leaning against my driver door.
^All of which should never be on a rod!
That sounds like a 'Rack Rod' : Car built to be placed in a building and used as storage shelves.