Bob, I trenched 1100' about 24" to 30" deep with a walk-along DitchWitch trencher. I can't remember how much; the numbers $80 and $160 come to mind; that may have been half-day and full day, or maybe that's what I spent for the 2 days I had it. Got it from the local Nations Rent store complete with trailer. It was completely hydraulic; even had hydraulic steering. No real effort required to run it. If you want to get absolutely straight lines, however, I'd run a string line to follow. It will trench to about 36" deep; use your TC24D to backfill the trench when finished. It will fit in the narrow spaces you mentioned.