Adds wing mirrors to large vehicles that can't see behind themselves

Ambulances, cube vans (though the low-end model is cheap and only has one), fire trucks, both RVs, mobile meth labs, and the Semi Truck.

APCs and armored cars *don't* get wing mirrors because the former wouldn't benefit from them, and the latter has acceptable view out the sides so the mirrors would just get in the way.  (If either's backing up under design-typical circumstances, it should have spotters around anyway.)