Unpredictable closures of highways can happen in the middle of nowhere after you’ve already been driving for 3 hours. I’ve had unplanned detours of up to 150 miles more than once. It is more common than people expect.
There are stretches of highway where it is 100+ miles between gas stations, never mind chargers, so it becomes a range risk even for ICE cars. I’m not the OP but when I’m driving in that part of North America I try to keep my range above 200 miles for this reason. It has saved me from being stranded more than once.
Alternatively, a backup plan for people with experience in those areas is to use ranch and forestry trails to route around the highway closures if feasible. This requires a vehicle suitable for that terrain. Few if any EVs are.
That said, most Americans rarely do long-haul driving in the backwaters of the American West. But if you do it enough, high ground clearance and reliable 400+ miles range in all weather conditions is a safety requirement.
The only reason I don’t have an EV is that most of my driving miles are like that. I don’t drive in the city where I live. No EV currently made credibly delivers that kind of performance but a lot of cheap ICE vehicles do.
Eventually EVs will get there but they aren’t there today.