From the link in the original comment: > The Drive first spotted the patent, submitted in April 2018 and published on September 15, 2020. Its illustrations sho

From the link in the original comment: > The Drive first spotted the patent, submitted in April 2018 and published on September 15, 2020. Its illustrations show a removable range extender that sits in the bed of a truck and looks like a toolbox. Inside the device would be a small motor, fuel tank, exhaust system, and electronics needed to hook it up to an electric truck.