Rear for lights installation

[H3 Hummer]

So this time year in the rainy Seattle weather it is more difficult to see even without the limited visibility of the H3. I want to install some rear fog lights to make backing up in the dark easier to see. The hardware installation wouldn't be a problem but the wiring would be a hassle.

I was looking under the dash at the steering wheel and there are a whole bunch of (unattached) wires that look like they are used for the towing package. They are not connected and I am wondering if I could tap those wires to an on/off switch. Those wires should be attached back to the tow receiver where I could connect to the newly installed fog lights?