Regarding this "mobile truck" in Mexico, OwnAccord posted the following in his "Unconfirmed 2014 Year Book Numbers - Peak Pubs, Baptized, Hrs, Reg Pio & Studies" entry:
"Mexico: It has been approved by the Service Committee to set up enter the International Book fair to be held 11/28 - 12/8 in Guadalajara. 90,000 are expected to attend. A mobile truck with Jw.org on the
outside will be set up.
I've tried to see whether jehovah's witnesses appear in the exhibitor's floor plan but so far, I've not been successful. I've searched for them using all the possible names such as "watchtower", "jehovah's witnesses", "testigos de jehová", "testigos cristianos de jehová", "congregación cristiana de los testigos de jehová", "jw.org", "la torre del vigía", etc. but it seems to me that either their location remains as "pending" in the pdf chart or they simply will just park their truck outside the fair and thus avoid paying for having a spot inside the book fair. After all, they seem to be happy to be recognized as "peddlers of God's word" (2 Corinthians 2:17).
A link to Guadalajara's International Book Fair: http://www.fil.com.mx/ingles/i_info/i_info_fil.asp