Last spring, I purchased a John Deere E130. The deck always been slightly uneven since it was purchased. It was very close, so I didn't bother with trying to level it. At this point, it's gotten quite a bit more out of whack. The manual instructions for leveling are quite clear, however, there's not a single level spot in my entire yard. My driveway is gravel, and has a slight slope just like the entire property does. Is it feasible, although obviously not preferred, to level the deck using the mower frame as a reference point on each side? If level ground is the only way to get this done, I'm not sure how on earth I'll ever pull that off. Any help anyone could provide would be greatly appreciated.