First of all get a Garmin GPS unit, they are the best. I traveled to Panama and back in 2010 with 2 others. We hit every CA country and took a year. I had a 30' Class A, the others were a 33' Class A and a converted Greyhound bus. We never had a problem driving anywhere or finding a place to stay, course we did boondock quite a bit. There are few RV parks to stay at, hotels and Balnerio's are a try.
When in Costa Rica I had my GPS unit stolen, the others had Tom Tom units. John had his daughter mail us 3 Garmin units while there, the Tom Tom units didn't show many of the roads mine did. Fill up every chance you get, a half a tank is an empty tank. Don't think you'll find a gas station when you need one, you won't. I had 2 dogs and when crossing into Belize I purchased permits which were good in every country except Panama. Hire the guys at the border crossings to help you thru Customs. It is well worth it as they take you to the front of the line. A few times I realized the customs agents were relatives of my helper. Also, before leaving the agent, check to ensure your passport was stamped. Once as I walked away I realized there was no stamp. The guy I hired was talking to the agent and he forgot to stamp my passport. Never take anything for granted as being done. Had a few minor issues when driving but nothing you don't run into in Mexico. Of course don't drive at night.
- Go online for current gas prices in each country. Have any maintenance work done before you leave as you will not be able to get parts for a RV itself. If you have a truck chassis you will find parts almost everywhere. I carry an extra house water pump, inverter, converter, air compressor for my tires, a 10 ton jack, a tire patch repair kit, flares, safety triangles, the bright orange stacking levelers (be careful using auto levelers if you have them as I damaged all my pads that year due to rocks, etc), air and oil filters, extra oil, tools and anything else you think you need. I boondock and seldom stay in RV parks so over the years I learned what I needed. I have a solar panel on the roof which is a godsend, plus my house generator. When driving during the day I charge all my batteries while the truck engine is charging my batteries.
- Buy good RV insurance for the countries you are traveling, don't take a chance going without it as your RV will be impounded if you have an accident.
- Have a cell phone and buy a chip for each country as you cross the border, they are very cheap and sometimes free.
- If you need local currency, use the money changers at the border crossings as they are all honest. Many of the guys you hire at the border crossings speak English. ATM machines are everywhere, never had a problem using one.
- When crossing the borders, carry as little food as possible as it may be confiscated. Happened once and we were upset as they took over $80 USD of food from me and even more from one of the others I was with.
- Near the larger cities you will find Walmart, Costco, and other large stores to shop.
If you want I can email you the GPS locations of places we stayed as we traveled. I also had the 99 Days to Panama, it was OK. Chris would go online as we traveled for places to stay and talking to other travelers we were told where we could camp for the nigh. I can email you the GPS locations of our camps. Ron
Ron