Yeah. The Maxpack Rivian. 400+ mile range. Rated to tow 11,000 pounds.
Real life for an owner who posted his experience has shown the MaxPack to have a range of 280 in freezing weather and hills pulling 11,000 pounds. A smaller lighter trailer, like your 3,800 pound trailer, means the Maxpack may well be up into the 300 mileage range if the environment is agreeable. It appears a number of regular electric SUVs can also tow up to 4,000lbs. Seems like there are more and more choices popping up out there on the market for towing.
From what I've gleaned off the net, your Sierra gets what...14mpg? My F250 got a whopping 13mpg for me.
At diesel prices today - $3.99/gallon to fill that truck's 38 gallon tank - I'd have to spend $152. And I couldn't refuel using my solar or plug into anyone's dryer or stove outlet like I can with my electric truck.
I remember being sick to my stomach watching a diesel fuel dispenser's dollar count rise and rise and rise as I stood at a distance from this cruddy pump locked on the F250 truck's fuel intake, spewing out noxious fumes as that diesel poured into the tanks. Even thinking back to it now it makes me ill. The cost of running that vehicle was one of the most compelling reasons for me to leave the diesel truck at home unless I had no other choice.