The Army will move the ISV-Heavy into its next procurement phase in the fourth quarter of 2026. The vehicle is being pushed as a commercial, minimally modified platform that closes a power-generation gap for command posts and mobile tactical networks.
The heavy variant is built around exportable power, with requirements for 60 kW continuous high-voltage DC output, 15 kW of 28V DC power and 4.8 kW of 120V AC power. That makes the ISV-H less a troop carrier than a mobile energy node for dispersed formations.
GM Defense remains in the frame with a militarized Silverado HD 3500 proposal. The Army is now signaling a faster acquisition path, and the competition should sharpen once proposal requests drop later this year.