Yeah, we put as much fill into our foundation as on our driveway, which measures 1820 feet. The east and south elevations have a steep slope. My old riding mower would choke while mowing it sideways. The new zero-turn 42-inch Toro Timecutter has no problem CLIMBING the slope; the difficulty is in going downhill or making a turn. I get a lot of bald spots where the rear tires slippage as a result of the engine's trying to hold it back from running away (and potentially hitting a tree). I know of no solution. I just do the best I can with the obstacles the terrain presents (a tree, a rock, and the granite steps leading down to the back lawn).