No matter how many troop-carrying trucks and petrol stores these guys have, they'd have a hell of a time moving people around enough to defend against a three pronged attack. Most of their training is oriented around heading as one force straight south (except for the commandos who would infiltrate ahead of time and commit assassinations and sabotage).
Also keep ethnic Korean U.S. soldiers in the area for ad hoc task forces to create trouble in the Korean area of China along the river to stir up trouble if the ChiComs get the idea to join in the dance once again. Presumably the ROKs also have people that could do this if they were willing.
This is disgusting. Frankly it is one of the prices of free trade with China. I bet most Americans would recoil at the thought that thye might be buying products made in such places. I wish someone could find out what they are.