I hear lots from dealers about how great their spindles are, thick diameter, better bearings, etc. What's the real truth out there? Considering JD 757, Toro Z500 series, Exmark, Hustler Super Z, Ferris IS 3000, and Everride Warrior. Which has got the heaviest duty/best spindles/bearings that can take an occasional run-in with gopher holes, and occasional rock, etc. with least likelihood of bending/damage? What brand ztr's are the most prone to spindle/bearing damage? Looking at the above with 60" decks by the way. Thanks for helping out this newbie.