Thanks, socalserf, Phssthpok, Rarick, for that spate of ideas. I have a headlight that's already wired for use with a 12-volt battery. I could easily adapt that to shine out my rear-door window. I like the rear-lights cutoff switch too. Blast 'em with headlights then cut all visible lights.
BTW, I got ingredients for two disguise kits, one for house, one for van: hair color kit, depilatory cream, and sunglasses. Still need colored contact lenses, skin darkener, face-changing materials. Also ordered chemicals for making my own smoke bombs.