What Jeff and Oosik said. you don't need a pricey power tool that will choke or break on 'dinnerplate'-sized rocks. I carve sod from the edge of the driveway, curbs 'built' by POs plowing snow with a blade best left to o'pavement use. Sod lumps result. I too use a chain fence drag, going over the clumps pulled by the golf cart.
Oosik found what I did to do such a 'smoothing' job, and sweeping u-turns leave no trace on adjacent mowed areas, actually blending the edges. 'Sod clumps' become fluffy 'hair-balls' as after a few passes the dirt crumbles from them.
For big scale jobs, I salute Jeff9366's suggestion of a chain harrow. I also agree that a disc harrow is good for this kind of work. Where I have more roots than rocks, I start with a chisel plow or subsoiler, then I disc, then remove rocks. I always like to vet what tools I have vs look for a place to store another PTO implement that should be kept outdoors the 90% of time it sits. :2cents: