Wire gage used in stock 7 way trailer connector.

[PED]

Does anyone know what gage wire Chevy used for a stock installation of the 7 way trailer connector? Common aftermarket wire bundles often include 2 ea 10 ga, 1 ea 8 ga and 4 ea 12 ga and the 2 ea 10 ga are used for the 12V and ground leads. I want to tap into the 7 way receptacle at my rear bumper to provide power to a small air pump and I was hoping that Chevy used 10 ga wire for the 12V and ground connections. My air pump (Viair) pulls a max of 30 amps. A 10 ga wire is rated to carry 30 amps of 12V up to 25 ft so if the 7 way wiring has the 10 ga, I can tap into it rather than run new wire to the back bumper.