Supplier innovation is within the business spotlight proper now with automakers under pressure to ship new-era powertrains, sooner improvement of latest fashions, lower manufacturing prices and software-based product enhancements. GMC plans to add two vehicles to its business portfolio — a full-sized battery-electric cargo van and a medium- duty truck powered by Ultium batteries and Hydrotec hydrogen fuel-cell technology. Not all brands or segments are constructing on the same fee, and total client demand remains robust, auto executives say. Still, on a macro degree, once-empty dealership lots are starting to fill again. The AutoGuide News Blog is your supply for…