I have a big Pittsburg single bottom moldboard plow. I can tear it down until all I have is a single shank ripper. I've used it when I need to run shallow utilities. It has a spring loaded trip mechanism - which, in my case, is VERY handy. All of my 80 acres is underlaid with basaltic lava bedrock. A lot of this bedrock is very close to the surface.
Andy-does your middle buster ever catch on an unmovable object and what happens?