The range is fine for single-driver operations, as the driver still has to stop and take rest breaks equal to or longer than the stated time to recharge on a 'megacharger'.

I suspect that there will be deals done (if not already in progress) between Tesla and/or Fleet companies with truck stops across the country to install (paid) megacharger stalls at appropriate distances.

Even if charging time is slightly longer, it might still work out equal if the power of the truck lives up to expectations, and the truck no longer needs to slow down when going up hills.