I think you are describing a hybrid. The power company at my previous location had hybrid rigs for working on high voltage [1]. There are also hybrid fire eng

I think you are describing a hybrid. The power company at my previous location had hybrid rigs for working on high voltage [1]. There are also hybrid fire engines. [2] [1] - https://www.pge.com/mybusiness/environment/pge/fleets/ https://www.pge.com/mybusiness/environment/pge/fleets/ [2] - https://chargedevs.com/newswire/los-angeles-fire-department-unveils-hybrid-fire-truck/ https://chargedevs.com/newswire/los-angeles-fire-department-...