Thanks for the tips. I probably wouldn't want to bolt something to the FEL for the reason you mentioned. I was thinking a couple passes with that subsoiler might work, if the gravel was wet, and I were willing to take a few passes at it. If it doesn't, and I end up using a shovel to dig across the driveway, it would just be two paths, ten feet each, and I plan on running several hundred feet of cable, so that's not too bad.