After 15 years of maintaining 4.5 acres of yard, 3 of which are a 1600' runway, I would like to say I have solved the rough yard/runway problem. I haven't!!! I agree with Stonehaller that you can over compact the soil, especially in the spring, inhibiting moisture absorption and root development. To combat that situation, in the spring and early summer I use a 7' double roller culti-packer with water tanks as additional
ballast. Again, this is only effective if my soil has adequate moisture to allow penetration by the "V" shaped rollers. It usually takes about 2" of rain to reach that moisture level. The cultipacker opens the soil up, splits the high mounds and moves a little dirt. If you pull the cultipacker and you hear the rollers rattling, the soil is too dry already. Typically, pulling it the length of the runway, the high ground is too dry and the low ground is too wet. Multiple passes are required to show improvement.
The neighbor's 7' LP tank although handy, is in my opinion too wide and not tall enough to be effective for smoothing the yard or runway. Even with excessive moisture, (squeezing water ahead of the roller), I have not been satisfied with the results. Under the same conditions, the 48" concrete roller will give noticeable results. By swinging the tractor hitch to the right to offset the roller, it will erase the right side tire impressions of my R4 tires. My rears are loaded with beet juice and to erase their marks is an accomplishment.
When I put the runway in, a neighbor with large equipment offered to disc the field with his 20+ ft. finishing disc, which did an excellent job of leveling. The ground had been a bean field and was relatively smooth to begin with and no grass clumps to deal with. Fanned on a fescue mix and rolled with the packer. Since then have mixed in some rye grass, bluegrass mixtures to end up with a decent lawn. If you are trying to smooth a farm field, unless you are willing to tear it up and start from scratch, dealing with possible erosion and runoff issues, costs, and bare ground problems, I would consider hiring someone with a large vibrating roller to come in and give it a try. I have threatened to have mine done and it may still happen.
I hope this little insight is helpful. Keep in mind a roller, unless large and vibrating, will move a little dirt a small amount, level the clumps, molehills and grass tufts and possibly seal the top layer more than you want to. Perhaps someone will speak up, who has had that vibrating roller in their yard and will share their observations. Good luck!!!