You don't have to worry about most caravans except Caravanes Soleil out of Quebec. They can be about 35 rigs, but its mainly an issue in Tachos in PV. Usually they have itineraries posted on their sites, so you can avoid them.
Here are the main ones
Caravanes Soleil (Quebec - long stay in Tachos PV)
Amigos Rodantes(Quebec - ,mainly Yucatan long stay)
Horizon Lussier(Quebec - long stay in Telaquepaque Lo de Marcos)
DAPL (Andre Lafleur) (Quebec long stay in Quemex Melaque))
Adventure(US)
Caravanas de Mexico - Vagabundos del Mar (US/Canada - long stay in Laguna del Tule Melaque)
Fantasy(US)
