For a while I had them disabled on my '96 C3500 wrecker, when I first went out on my own in the towing biz. Then later I changed my approach with it. I re-enabled the DRL's and when I would get near where I was going to snatch a car, I'd turn the headlights off. The DRL's would be on, nothing else, and kinda dim...so it would just look like some junky old pickup truck. No cab markers, no fender markers. No light bar on the truck as I didn't work wrecks, and the unit was mounted under the bed so you didn't see it until I'm getting ready to load up.
Then before you know it, I'm gone with your ride.
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Richard