Keep some kettlebells, battleropes and heavybags around as well...throw in some firearm fitness training to make it more "across the board training"! You can get real creative for some good drills with that.
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If getting a front-loader in there is too difficult, how about a crew of Mexican day-laborers with hand tools and chainsaws? A couple hard-working guys can take a big notch out of a hillside in a short time, as long as it's clay or dirt they're digging, and not rock.