So someone showing up at the border bearing a ream of interpretations of vehicle terminology stands about as much chance as an ice cube in hell of swaying an Aduanero to somehow, by some miracle unforeseen to change his mind about a 3/4 ton pickup.
My advice is to WAIT. Wait until a few trustworthy forum members have absolutely proven a change in rules has been effected by actually going through with a TIP before getting all "wound up" about a sudden change of rules. Changes can only happen by rules being issued from Mexico City. NOT FROM AN INDIVIDUAL AT THE BORDER.
You can do this the easy way or the painful way. When the individual at Banjercito says "No" they do not mean "Maybe".
I just started another thread about his topic where I include some emails I received from SAT as well as the pertinent laws and regulations defined. This is not a CHANGE. It is the law as it was written. Some people at the border are misinterpreting the law. GVWR is NOT "capacidad de carga".
The only question I have not been able to get an answer to is how the would classify a pickup camper. I think that is part of the problem as the rules do not seem to specify.
As far as what I can find in the rules and what SAT has told me - there is no specific rule about GVWR - the rule is about "capacidad de carga" which means the amount of weight the vehicle has been certified to be capable of carrying by the manufacturer. In US terms this would be CCC.
Please see the other thread for clarification.