@Martin *****
how long have you had the truck for? How long have you been in Thailand?
Do you know the rule for a red number plate?
If I were you, I would call the showroom where you bought your truck from and ask all questions.
You must not drive your truck with the red number plate for more than 3 months ( it is illegal and probably the insurance can deny paying if there was an incident).
You need a TM30 before you can get a 90 day report( what visa are you on?). TM30 is not hard to get- get your landlord or any hotel you stay for a night to issue it for you( online report and print out or fill out the form in TM/ custom office.
You should have a blue book and insurance file with you and check it out regularly. If you have the insurance - you should have your address in it and also in the blue book.
If the Ford retailer refuses to provide you any support- it probably they did not do things correctly.