What are your opinions on handling/stacking 5x6 round bales with open station tractor? Have heard of many a horror story on bale rolling back at operator, but is this only when someone uses a regular bucket with no grapple? We've been using a 4020 w/ 58 loader and bale spear. Have never had much of a worry with that. Just wondering some of your opinions? Like everything just use common sense right?