6 row Row Crop head it would handle just fine. Main concern with the 6 row corn head is the extra field compaction and stress on the final drives. Plus you wouldn't be going anywhere without some serious weight on the back. Maybe in 85 bushel corn, but anything else you can forget it. I know because I have a 4420, which is basically a 4400 with a black cab and some updates. We got into some 180 bushel corn with it last year and that 4 row head was all it wanted.