Pack it in...Pack it out. Collect your garbage and dispose of it at a local gas station when you fill up. Using smaller bags, like grocery bags, are so much easier to dispose of. We don't use big bags for trash when we're on the road.
We always put trash in Walmart bags and dispose whenever we get gas or stop at a roadside park etc. We always keep an eye our for trash cans but never use dumpsters or private trash.