St. Gerard... Welcome to the fun... I read your original post of your goal to tour southern Mexico and Central America. If this is one of your primary considerations then read on.
Beyond the adventure aspect, which is ambitious but has certainly been successfully done by many before, my initial thought is that you need to carefully consider the best vehicle to undertake this adventure. Having traveled extensively in 3rd world countries, if you don't already possess some general survival skills you'll want to add that to your to-do list. Just my opinion, but you will definitely want to take a Class A off your list for a number of reasons or figure out how to get your hands on a different vehicle for the travels to Central America:
- The roads are not like the US so be prepared to rattle and bump.
- Class A's need a certain degree of attention and availability of parts and qualified mechanics will be a major challenge.
- You'll almost certainly need to drag a toad which is more stuff to deal with.
- ...and the #1 reason in my mind; a Class A gives the appearance of wealth and excess, definitely not a good idea in this part of the world. This is not the place to look like a million bucks.
If I were going to undertake this adventure I would be looking at a self contained, reliable and rugged vehicle that gives the appearance of Rambo. Something that will take plenty of punishment and that you can do a get away in if required. This is a real consideration, once you cross the border reality changes big time. here are quite a number of expedition-type vehicles out there; one that fits the bill well is Earth Roamer built in Denver. It is built on a heavy duty Ford truck chassis and is designed for this exact purpose. These category of vehicles are totally self-contained, spare parts probably accessible, there are not a ton of creature-comfort accessories to break, and they are somewhat intimidating looking helping just a little to keep the bad guys thinking twice (probably not, but a whole lot better that a Class A).
Good luck with your adventure planning!