In my opinion, total control of the border wouldn't be plausible but increasing control substantially through a combination of ISR and an air mobile QRF is not only reasonable but should be a priority. When trains of donkeys loaded with ??? come through the mountain passes, there is something fishy going on. If they aren't carrying weapons, ammunition or explosives, then they are trying to circumvent the tariffs at the official border crossings and the money is probably going to fund nefarious activity, anyway.