I don't know how they did things in the past, I've only been going to Mexico in my vehicle for 12 years. I have the receipt for the canceled, old, trailer TIP, all done properly, with a hand held computer, by the attendant. I just want a new 10 year TIP for my new trailer. I want to do this properly, legally, to avoid trouble. Now, trying to do this correctly on line, all I get is frustration. Try calling to Banjercito with little Spanish skills.
Maybe we need a big red rubber stamp instead of by computer, I don't know.
I will get this straightened out at the border. Thank you all for replying to my problem.
Wishing you all miles of smiles!