We already have considerable overland experience with NAFTA, which allowed Canadian and Mexican flagged truckload carriers to travel from point to point in the US (it’s still illegal for US based carriers to travel point to point in Canada and Mexico without a special permit). The takeaway is that US safety standards are higher and much more rigidly enforced, and foreign carriers therefore struggle to meet US standards for shipping goods within US borders. The US transportation industry still protects itself by promoting those rigorous safety standards, which forces Canadian and Mexican carriers to adopt them as well...which makes them less competitive on freight rates back home. Thus, foreign shipping has a toehold on the landward side, but it’s unlikely to overcome domestic shipping without serious changes back in their home nation.

Note that crime rates have not risen much. The most common felony before NAFTA for commercial drivers was transporting firearms into Canada. The most common felony during and now after NAFTA is still transporting firearms into Canada.