An Amazon electric heavy-duty truck in San Bernardino, Calif. (Amazon Photo)Amazon is bulking up its fleet of electric vehicles beyond the delivery vans that many customers are accustomed to seeing in their neighborhoods.The company announced Tuesday that it has begun rolling out nearly 50 heavy-duty all-electric trucks in Southern California — its largest such fleet — to handle first- and middle-mile operations to help further decarbonize the tech giant’s delivery operations.The trucks will haul cargo cont ...