Chances are what made your field bumpy and uneven was moldboard plowing. Depending on the size of the plow, plowing will leave 12"-14"-16" furrow irregularities in the field. ((Primary Tillage))
After plowing, Disc Harrows, a form of Tiller, are most often employed to reduce furrow irregularities by 50% to 6"-7"-8", then Spring frost/rain may reduce Disc Harrow irregularities further. ((Secondary Tillage))
After discing, repeated passes with a Landscape Rake with gauge wheels, Chain Harrow, Spike Harrow or S-tine Cultivator with shallow row crop sweeps are required to get a field level. ((Tertiary Tillage))
Finally, a Cultipacker, used to roll in seed, will firm the level field but leave 2" irregularities of its own creation, which may decrease with weathering. ((Tertiary Tillage))
You need to have a meeting of the minds with your renter regarding your expectations. Otherwise renter will spend a lot of time and fuel and experience a lot of body jostling plowing, yet you both will be disappointed in the result.