It's a fact of life an EV truck is going to need a battery which is heavier than a corresponding diesel engine for the same power output, thereby reducing the payload of the vehicle by about 10%.
Therefore, when a fleet of 400,000 diesel trucks is replaced by EV's, 40,000 extra trucks will be needed, along with 40,000 more drivers and an unknown quantity of extra maintenance staff.
I don't know what criteria were used to deem the tests successful; however, they certainly were not on the basis of financial and logistical benchmarks.