replying to bill allemann, Jeff wrote:
There's a tool called a Hitch-N-Ditch that might work if you have a truck or
tractor.

http://www.hitch-n-ditch.com/

Here's a Youtube video of it in action.
https://www.youtube.com/watch?v=VrTGoKb3Bu4

While we are on Youtube, there's also this guy who made a hand tool for short
distances and he also has a "tractor" with a similar trenching tool on it..
https://www.youtube.com/watch?v=FYqghiI-ryQ

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