We took our first 5th into Mexico a few years ago - registered to husband - didn't return the permit - and then sold it in Canada. We now have a different 5th, and are returning to Mexico in January ...
Personally I'd call the folks in Mexico for their opinion...which is the only one that will count. With all the permit issues and seizures down there, I'd make sure all my tees were crossed and eyes dotted...I wouldn't want the Mexican Government to seize my rig for permit violations like the others.....just sayin....Dennis