A good paint store can take a piece of your trailer, (like a compartment door) and mix paint to match and give you a code for future reference.
I have more than once been very tempted to paint my Airstream even though it polishes up pretty nice.
I still might.... I am not a fan of the act of polishing.....
Paint could look pretty dang cool, especially if a person feels free to free style a bit..
By the way, if you are going to spray, I recommend industrial Imron 3500 HG, good stuff for a good price. Two gallons is more than enough to paint any Airstream. My cost is about $100 a gallon. (One gallon will paint a 22 footer if done right)
That is what the red is in the photo. It looks pretty darn nice as sprayed, and it can be cut and buffed to perfection if a person wanted an absolutely flawless finish.
If I was painting in my shop, an as sprayed paint-job would be about 3k for one color, and another $500 for two colors using the "cheap" imron.
"Regular" auto paint would be more as the paint alone would be near 1K and up.
FWIW,,, I could have painted my trailer two or three times for the same time I invested in the polishing, and even though it lives in doors, the glory has faded from the polishing.