I have an article in RV Times this month on this subject. See http://www.rvtimes.ca/wp-content/upl...166reduced.pdf
I am wagon master on 3 caravans there this upcoming season, but for those who wish to venture there on their own I have GPS co-ordinates in the article on where to stay, en route.
I always get asked about taking RV's on the train, but that was stopped many years ago due to liability concerns.
I have a lengthy article on RVing in Mexico coming up in Trailer Life. Not sure when, but November or later.