Tow services for large vehicles are just as sophisticated as those in the USA. They have big KW's with wheel lifts, air bags for lifting trailers and all kinds of retrieval equipment to get you out of a ditch. The drivers are true professionals. I have found cell service on the quotas to be as good as say Verizon on US freeways. Good Sam offers emergency service in Mexico and they dispatch from some central office.
Moisheh