Upvote:0
Think this may initiate a starting point for the answers you seek.
The abstract in quotes below alluding to International Registration Plan (IRP), originates in the Mississippi Department of Transportation - Commercial Vehicle Enforcement Manual. On page 3, the second paragraph up from the bottom of the page.
"All states of the continental United States and Canadian provinces are members of the IRP. Vehicles that do not have IRP registrations and meet or exceed the limitations may secure a trip permit for the privilege of using the Mississippi highways. The twenty-five dollar trip permit or 72-hour permit may be obtained through the Jackson Permit Department or from the first weigh station upon entering the State.
http://mdot.ms.gov/documents/enforcement/Manuals/Commercial%20Motor%20Vehicle%20Manual.pdf