These electric trucks would work for line haul or dedicated. Either way with diesel being $6+ a gallon big companies like Swift will still see bottom line savings even if they have to spend a few bucks installing fast chargers at DC and Hubs.
It wouldn't work for all Swift drivers at the moment. Not every driver knows where they are going to park the truck and take their required break.
There simply isn't any charging availability at most places where a driver can take there required FMCSA break while keeping the truck rolling effectively for the amount of hours a driver can drive. Many truck drivers live in their semi while on the road.
So if a driver has 25 minutes of drivetime left and knows of a state rest stop 10 minutes away he can break at, he/she will probably go there.
Things will change in time.
What I don't want to see is these trucks catch on, go automated and see lots more trucks on the road. I think automated trucks will mean much less Intermodal rail service use. I bet the I-80 and the I-10 will be a parade of driverless battery powered semis in the future.