I have owned three of them, and have not found that the 3000 series machines are particularly tippy. I will say they are not as stable as the 4000 series machines, nor do they feel as stable as the 2000 series machines, particularly the 2520 styled ones. One can, though, look at the design of the 3000 series and see why they might not be as stable as some other JD offerings. When I was looking at tractors in the very beginning I was taping off areas in my garage to estimate space taken by both a 4310 and a then 4115. They were extremely close in actual tracking size, but the 4115 was much lower and lighter. This has carried over to the new models also. My only complaint noted on my 3000 series machines has been that they inchwormed a good bit when going down hills with a loaded bucket and that they were prone to lifting rear wheels when transitioning down into gullies, etc., or into soft ground. This, to me, was more a function of wheelbase more than width or height. It was remedied some by adding ballast, but not eliminated. Although I have never owned a cab tractor, I suspect this problem would be exaggerated in that setting. I have never been much of a wheel spacer fan, but I am sure that would have some positive impact. Interestingly, this seems to defeat at least some of the tractor's "compactness" and makes a move to a 4000 series for size reasons more appealing.
John M
Boy this unit seems lie a go kart!