I think this thread was probably posted in the wrong place originally. Now on the correct place in the Mexico forum. Other than John & Angela and a couple others I have never see so much misinformation at any time in all the years on this forum.
I have been driving by RV in Mexico since 1971 if that makes me anymore qualified than those who posted here. They have been building new roads like mad all over Mexico. The economy is booming. The drug cartels mostly only kill other drug people. The police and military have been systematically killing off the cartels. The toll roads are expensive but very good roads for the most part.
If this thread has now taken you to the Mexico forum you are in the correct place to ask questions of people who have been there and done that. Not those who read yellow journalism or watch the misinformation found on certain TV so-called news which I won't mention but rhymes with ox.
For the past 8 years we have been roaming all over Mexico every winter in our 40 foot motorhome with our car towed behind. We have been to 28 of the 31 states. We have been to beaches and mountains - big cities and small towns. We have never paid any kind of bribe or even been asked to pay one. The only police we have encountered have been very helpful. We now know where must of the RV parks are located and where to park if we can't find one.
Many Mexican mechanics can fix almost anything.
Go on the Churches' www.rollinghomes.com website and buy their Guide to Mexican Camping and then look at their online updates for all the updates to the book for the latest on travel in Mexico.
DO NOT take guns of any kind into Mexico without all the necessary permits or whatever - I have no idea what that may be or how to get it. There is a former Marine in prison there (at least he was) for getting caught at the Tijuana border trying to smuggle 3 fully loaded guns carried in the driver's area into Mexico. There are all kinds of claims online about how this guy made a mistake. But anyone who takes time to research the facts will find he knew exactly what he was doing and he got caught. They even have video. He had been across this crossing many times and had a girlfriend in Tijuana - and had crossed on foot earlier the same day he was caught with the guns - he had a hotel room and receipts for all his crossings and hotel stays have been posted online. His passport record shows his many crossings. He went to prison because he broke a very strict law - with huge signs saying this at every border crossing. If you do not break serious laws in Mexico you will have no problem with law enforcement authorities.
Now that you have hopefully found the correct forum you can begin to ask specific questions. Although we have been all over Mexico by RV we have only been to Belize by airplane. We have heard that once you leave Mexico the roads can get rough. But there are others who visit this forum who have been further south than we have so you may get some help from them.
We do not spend any time anywhere near the border so cannot help you there. We go at least 1,000 miles south - and more. We do walk across the border at some locations for medical, dental, eyecare reasons.