Actually... you don't know…
Actually... you don't know what you're talking about even though you'd like to present that you do.
"So the trucks skin is obviously not stainless, it wouldn't stain if it was duh."
I is is stainless steel. Bro, it's LITERALLY in the name - Stain-LESS steel. Let me repeat... Stain LESS. It's not called stainproof steel. There are varying degrees of StainLESS steel with different abilities to... you guessed it- stainless.