My trailer looks to be similar color. It was a GM color. I saved this info:

It's a GM Pewter Metallic.

ENGGM4900 Dupli-Color® Scratch Fix 2in1®; Pewter Metallic;

GM Paint Codes 11-382E /386E /11-522;

or on Lightning's website here are their color names....do you have your buildsheet, or remember what color you picked...then we can google that color name?

http://www.lightningtrailers.com/Options