Steve, of that 4 wheeler will pull it, you don't need a SGT. Your cubs will jerk that roller around with ease. Actually that's hard on the slip clutch in your 4 wheeler..... they aren't tractors.
John,
Yes, frost heave leaves the ground very rough. Plus, bugs, moles and the like do too. Very narrow window of opportunity to roll when it is most effective. Ground is softest in the spring, shortly after the thaw, but after it has dried once. The window here is long gone. Not to say you can't use a roller later, but it isn't as effective.
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