As night arrived, racers in their motorhomes and toy haulers began firing up generators for lighting, heaters, and appliances. Oh, well, we had instead…cold and darkness. Or rather, that plus the Sierra’s annoying LED interior and bed lighting. One wonders if any GMC bean counters, product planners, or engineers actually use what they design and sell. Because, frankly, every such LED lighting system we’ve tried is junk. They draw so little current, you’d think a robust battery of the caliber required to start the Sierra’s turbo diesel could run the lights for days. But, no, instead, they shut off after a precious few minutes—even though you’ve faithfully pressed the intended button with this basic wish: “Lights, please illuminate and stay illuminated until I decide otherwise.” You know, like a ’61 Corvair Rampside would do! Piling on grievances here, the LED lighting is insufficient for doing any kind of detailed work. Fail.