May I suggest an alternative mode of freight that pre-dates trucks and can move much larger volumes at a much lower CO2 cost, namely... a transcontinental train line?
(obviously not going to happen, and might even trigger a few PR cycles about a "hyperloop", but if you were going to try to build large-volume freight, that's where I'd start)
Note that it takes about 10000 trucks to carry the 2 million barrels of oil in one typical oil tanker.
Also another argument against trucks: they consume fuel to carry fuel.
Don't feel bad, a pipeline is just a different type of train. The tracks are hollow and the cars are molecular in size.