I just purchased a Turf-Aire 48 inch core aerator for my acreage. Set it up with hydraulic wheel lift. I add 9 concrete blocks on it's top storage deck for extra weight. Pulls 4 inch cores consistently. Absolutely wonderful with easy seat time. Will pull quite a load when on a hill or at startup, but no need to run in low range.
This is the project I finished prior to the "engine kill" problem I posted earlier.
Have fun with the 12 acres!