My neighboring town has contacted me about spraying a dry creek bed for them, with a total vegetation killer. They had a guy from American Beauty or what not, do it yearly, but has since retired. This has some large riff raff along it, and some difficult to access areas also. Approximately 20' wide down both sides and 2300' long. I have never sprayed anything like this before. What would be the easiest way of spraying this? That is my main concern. I own a Space Saver sprayer, and a couple backpacks. Is there a different gun I could use on the sprayer to spray 10-15'? Also would the small spot sprayers you can get at the farm stores be compatible with a spray gun like that?