If multiple meth labs were shut down within a quarter mile of my place in one of the "best" areas in Austin, then I'm sure they will be found anywhere.
For college students (chem/biochem/etc.) it is a source of tax-free income, because if you can brew booze, you can cook meth. For people who can't find work, it is a means of survival.
I'd probably say that one would have a smaller chance of encountering a meth lab while RV-ing than in a S&B neighborhood, just because neighbors would easily notice the LP gas bottles that smell of ammonia, the missing batteries, and the people coming in and out for rocks.