But the Amazon jungle is just one unexplored territory for carriers.

Throw in autonomous trucks (Albrecht thinks they're coming sooner rather than later, as Silicon Valley entrepreneurs will "ask for forgiveness rather than permission" from federal regulators as they work with more easily swayed state DOTs) and digitally driven pricing and capacity transparency, the trucking industry could look completely different in a generation. 

"If we get a vehicle with no driver, the power play 20 years from now might be brokers and 3PLs will decide to own some trucks, with massive trailer pools," Albrecht speculated. "Why would you need a US Xpress? That's a Jetsons scenario, I realize, but I say that because California DOT recently said that their vision of autonomous trucks does not include drivers—and if California gets behind it, it's certainly becomes possible."