I have heard that that chopper will perform way better by speeding it up and will help pull away from rotor too. This also comes from guys who sell them too, but I do see their point. The whole grain cart thing is a toss up beings you already have the second machine. I would say depending on what condition the 62 is and what kind of up keep needs to be done on it you could just keep it and run it or trade it off on a cart. I don't think that one combine and a cart will do what 2 machines and no cart will do. I also depends on how far the combines have to travel to dump. The thing that I like about running two machines is if you have a break down there is always another one still running. Yeah the bigger machines may do more than the smaller ones but if and when it goes down you just lost all of that. Thats just my opinion. I do most of the work myself so usually if something happens I can get it running right away. I was about 11 when my dad let me run combine, I had been riding with him for years so I kind of knew already what to do, but I thought it was pretty cool the first time he actually got out and let me make a few rounds by myself. That was 22 years ago. Let me know how that 40ft head works out. We had a FD70 and a 974 out this year and there is no comparison between the two. The FD70 flexes so much better and once I got more familiar with it, it was easier to set.