Read an article in a car magazine that explained why the one light failed on all those pickups. Can't say I ever saw one with both lights working.
The plastic grill was molded, lots of gussets in the grill making it stiff, which raised the "Harmonic Frequency" that it vibrated at as it ran down the highway bucking winds. Most times the grill vibrated at a frequency enough different than the frequency of the filament in the light that nothing happened, but with the stiffened grill the frequency of vibration was so high that when the frequency of the grill holding the light and the filament matched, the filament just went crazy and exceeded the strength of the tungsten and the bulb failed. The article ended with the suggestion that you cut some or most of the molded gussets so the grill and light had WAY different frequencys.
Bet Chevy built trucks with that problem for 20 years or more.
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