Electric dolly turns diesel rigs into two-headed hybrids in minutes

California startup Revoy has developed an innovative battery-powered dolly that transforms traditional diesel trucks into hybrid electric vehicles in under five minutes. This self-contained electric drive unit fits between a truck’s cab and trailer without requiring any modifications to existing equipment. Powered by a 575-kWh battery pack, the dolly provides about 250 miles of electric range and assists with propulsion, reducing diesel fuel consumption and emissions. Additionally, it offers smart features such as steering assistance, regenerative braking, auto-reversing, and blind-spot monitoring, enhancing safety and driver comfort. A key component of Revoy’s approach is its battery swap network, where drivers can exchange depleted dollies for fully charged ones in roughly four minutes—much faster than diesel refueling or fast EV charging. Currently, swap stations operate in Texas and Arkansas, with plans to expand along major freight corridors. Rather than selling the dollies outright, Revoy leases them on a per-mile basis, enabling truckers to adopt electric propulsion without large upfront