Rocmoc's point is IMHO right-on-the-mark. A PRINCIPAL goal.
When I camp I -never- do so without first checking with a local family if the area is "safe" or not. I am not going to pay a damned fifteen dollar or twenty dollar fee to pitch a tent every day either. RV'ing is one thing, camping is another.
Probably the best book written on camping in Mexico is
The People's Guide to Mexico
written by Carl Franz, Lorena Havens and Steve Rogers.
A new edition just came out. Most Mexico camping books advise me to go to where I do not want to go. The People's Guide does not try to do that. It guides you to how to camp, successfully.