The WT option list shared in this forum shows two battery options, but no specifics on capacity.
What GM’s engineers have revealed is that GM’s Ultium platform for the BT1 trucks, including Silverado, provides three different dual-deck truck battery configurations. 24-modules (200+ kWh), 20 modules (167+kWh), and 16 modules (135+ kWh). The Hummer SUT truck Ed 1 has the big 200+kWh pack, with both 20 and 16-module packs as future options. The Hummer SUV Ed 1, having a shorter wheelbase, can hold a 20 module pack, with the smallest 16 module pack as a future option. It is likely the $40K Silverado WT will have the 16-module version. Not a bad deal when you consider what Ford and Rivian charge for their 135 kWh trucks.
It is likely the basic WT with the 16 module pack will be significantly lighter, as the smaller pack alone will be 1,000 lb lighter than the 200 kWh pack, which then means the basic truck structure and suspension have less weight to support and can also be lighter-duty and lighter-weight. I'd expect the base WT to be 7K lb. These savings would reduce cost and improve range efficiency. Depending on your driving speed, I'd expect to see well over 2.1 miles/kWh at 70 mph highway speed. Even the 9K lb almost-brick-shaped/off-road-tired Hummer EV owners are seeing 1.6+ miles/kWh on the highway at reasonable driving speeds.That’s useful information, based on the 400 and 320 ranges for the 24 and 20 module pack, we come to around 256 miles range for the smallest pack. That doesn’t work for me, maybe I could get by with 320. Somewhere around 1.9miles per kWh. Between the Tesla, prime and home my solar is maxed out, going to need more solar and batteries, really need the largest battery pack to give me more charging flexibility.