I might add, we had some difficulty getting a permit for a trailer after getting a permit for the truck. A message popped up telling us we had not cancelled a previous permit, as soon as we entered the passport number. I suspect it was refering to the truck permit just obtained, despite them being 2 different catagories. Last year I did this same combo, but I did the trailer before the truck, so I advise doing it that way. I have an email into banjercito to try & ID the issue. In this case we simply did the trailer in the spouse name as both are on both registrations.
Regardless when getting permits for trucks & trailers, there is a lag of a day or 2 before you can do one after completing the other.
You can check status of previous permits at this link
https://portalsat.plataforma.sat.gob.mx/aduanas_cpitv_internet/index.aspx
