Congrats! I'm not too far behind you. Currently planning to roll through Mexico en route to Belize in late January.

Some questions for you:

What are you using to map your route through Mexico? Do you have a GPS with accurate maps of Mexico that can do turn-by-turn directions? What type of place should I be looking for for overnight stops? Is fuel readily available for a vehicle that only has a range of 250-300 miles (perhaps even a little less when loaded and pulling a trailer)? Out of curiosity, why McAllen instead of Brownsville or Laredo?