If the vehicle is phisicaly in the USA that is the important isue, the vehicle is out side the Mexican territory so the TIP expiring will not be a problem, on the other hand if the vehicle is in Mexico, that will be a problem.
When you re-enter Mexico, have receits of purchases from the date that the TIP expires and later to prove that the vehicle and you were out of Mexico, fuel receits are great, sprcially for an RV when the paperwork states that you bought 45 gallons or more and the toad only takes 12 to fill up it becomes ovious that your unit was with you, specially when using a debit card or credit card.
navegator