I'm not sure what you are getting at. My observations, from the roads, and streets inside the 25 mile zone the Mexican trucks have been operating in for the past dozen plus years.
Many of what they call trucks resemble what you'd find in a junk yard in this country, tires so bald, cords are exposed, air brake systems with constant air leaks, wheels, brake shoes, and drums coated with oil, and dirt from leaking seals, engines slobbering oil all over the road.
We are told that the trucks crossing out of the 25 mile zone will be in good condition, that sounds good, but that's not how things work with Mexicans, they will try anything they think they can get away with, and then some.
What's to prevent the junk from venturing beyond the 25 mile limit? The same thing that prevents illegals from jumping the border?
I posted this on another thread but it fits here too:
What U.S. truckers in their right mind would WANT to transport goods to their destination in Mexico? It would take them YEARS to get to their drop-off point. First they would have to play dodge-em with all the 1950’s vintage cars that inhabit the roadways of Mexico. And all the break-downs associated with old cars. Or the farm vehicles that go 1 mile an hour on a good day. Plus another good chunk of Mexicans drive like they are drunk, which may very well be true. Erratic driving is the norm. Then of course, there will be the set-up robberies of our trucks, with the help of the Federales to make it easier, with phony traffic stops.
Meanwhile, back here in the good old USA, we will have Mexican drivers going to their destination points in our country who don’t know our highways, the rules of the road only a bit, who may imbibe drugs or drink on whim, who could be terrorists, delivering bomb payloads instead of goods, and taking who knows what drugs or contraband back and forth over the border. While putting U.S. truckers out of business. Such a good deal for us, si senor?