Yes, a sidehill combine has four wheels, each one hydraulically driven and each one independently raising or lowering its corner of the machine to keep it level on hillsides...VERY scary until you learn to have faith in the pendulum that swings in the gearcase in 90-weight oil, automatically raising or lowering the wheels independedtly within a second or less as conditions change. I could tell you some stories on steep,steep hills! The worst part is the end of a row on a ridgeline 200 feet above the Willamette River a half-mile below! One front wheel right up by the cab, the other wheel down-slope, eight feet below your feet. When you come to the row end and crank the wheel, you hear the hydraulics scream and whine and whew!!! Did not tip over even with a quarter-ton of wheat in the bin!
I hope the JD gets a good workout, and that she's got the separator set up and tuned perfectly for the wheat you guys thresh!