Shepherd vehicle?

Usage examples of moonlighting.

So Vann was a cop, and he was working for some Navy guy-- probably moonlighting.

Some daymares must have been moonlighting, because nightmares never brought good dreams.

I get lost and short of fuel, then I am taken in tow by some moonlighting harebrain with a passion for veteran aircraft flying his own Mosquito through the night, who happens to spot me, comes within an inch of killing me and finally a half-drunk ground-duty officer has the sense to put his runway lights on in time to save me.

I told him about my plans to spend the upcoming month-long Christmas break in the Albany, New York, training camp of “Gentleman” John Griffin, a political science major at Brockport who was putting himself through school by moonlighting as a professional middleweight boxer.