This is highly dependent on how you drive, elevation changes, weather conditions, load/trailer weight/aerodynamics, and average speeds. So... I've seen both better than EPA ratings and worse than EPA ratings. It's rated at 320 miles on the 131kwh battery, which is about 2.4 mi/kwh. I've driven at times ranging from 1.5mi/kwh to 3.5 mi/kwh. So, I think it's accurate for their mixed highway/city test. If you're doing pure highway and thinking about a road trip, that is worst case scenario. At like 70 mph it's going to be around 2-2.1 mi/kwh unladen, so it'll be less than EPA rated, faster speeds get worse due to aero. At 2 mi/kwh that's 262 miles of range.

On a road trip I'd also keep the truck between 10-80% state of charge for optimal charge speeds, so I'd only get 70% of the range, or 183 miles. So I'd plan to stop every 150 miles or so.

This is actually similar to my real world results driving a Tesla Model 3 and Y. For the most optimal total trip time you're usually stopping every 150-200 miles or so.