a 4rw 7000 has the wheel brackets welded on so if you are going to try to make it a 30" unit some cutting and welding is involved, the jd bean cups are ok if you take time to set it for seeds per feet by trying it on a hard surface but if you wsitch varieties with a differen't seed count you need to re-set it or risk using too little or too much seed, I plant 150,000 in 30" rows, I was one of the later converts to 30" corn in this area, though we had been planting drilled and 19" beans before and quite honestly I had some pretty good 36" corn and never thought there was a night and day difference between 36 and 30 on corn but the 30's canopy quicker and most fertilizer applicators and sprayers are set up for 30", narrow beans help us but the 30's are as good as anything, some areas in Iowa still have a fair amount of wide row beans, as others said corn alf. would be best but if you are goin to put in beans on 30 acres it will work ok, might lose a few bushels but then sometimes it also costs alot "doing it buy the book!" and a few bushels lost might be offset by more machinery or custom hire expense
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