When I car camp I take a trash bag with me and pick up all the junk I find around my spot as soon as I start to make camp. And I take all of my own trash home with me since its usually next to nothing. I car camp a lot on the LBJ Grasslands near one of the horse trails and you're right, Jim, there is usually more garbage in those types of areas. But its only 20 minutes away and makes for a convenient last minute camping spot. We just gotta watch out for the horse manure.