>How will the trucks refuel?
Full serve gas stations.
>How will they handle loading and unloading?
Do long haul drivers typically load/unload themselves these days? I would have thought that would have been the task of the warehouse staff on either end.
>How will they handle inclement weather?
Probably better than human driven trucks why would you think they couldn't?
>What is the insurance liability for putting them on public roads?
Probably less than human driven trucks since you don't have to worry about a lot of things that will cause problems for those such as tired/impared drivers.
>Who will be sued when a driverless truck crashes into another car (at fault or not)?
The trucks insurance company. Same as it would currently happen.