Moisheh and Playaboy. I did the import in 2010. The TT was a 2008 but was new and had not been titled. SAT was not happy with the low price I paid and so I submitted a notarized letter from the manufacturer from who I purchased it directly.
As for the Class B, I only state the rules as they appear in the handbook on importation. Of course, there can always be an exception. As long as it's legal that is fine by me. But remember, three years ago, SAT swooped down on agencias aduanales who had been fixing things to make the importation possible. I don't want to get mixed up in that.
I have also considered just purchasing an extended van and have it converted by a company such as Sportsmobile in Texas or do some of the work here and the rest there.
The pedimento is important because the dream is to be able to travel through Central and South America and entering and exiting Mexico with valid paperwork is important to the process.