Renaultmagnum1234 Why so many trucks have MX and US plates?
The US and Canada use Apportioned system to divide road tax between the states and provinces (road tax on trucks gets sent to each state based on how many miles they drive in each state). Mexico does not participate in the Apportioned system (IRP), therefore every commercial vehicle traveling between the US and Mexico needs to be registered in both countries. Alaska and the Canadian territories (Yukon, Northwest Territories, and Nunavut) also do not participate in the IRP so trucks traveling in each of these places need multiple registration as well, for this reason it is super common in the northwest to see trucks triple-plated with British Columbia or Alberta combined with Alaska and Yukon plates.
Here is an example of one of these triple-plated trucks. https://platesmania.com/us/nomer27006772
Fun fact, Alaska also has a law requiring all trailers to be registered in Alaska, so many semi-trailers in the northwest are dual-plated Alaska + another state too.