Just so you are aware, if you happen to run across a Conservation 7000 or 7200, the wheel lift frame assemblies are bolted on and can easily be moved to get your 30 inch spacing. Also in the 7200 model you get MUCH IMPROVED markers, if you need them. Also the 7200 units are adaptable to the same attachments and after market parts as current planters, 7000 not so much. Good luck and happy hunting.