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If I were you and planning to buy, I'd rent first, just to test drive one.
You may also find that it's a lot less expensive to just rent once a year rather than ever buying. Your garden is not...

I've had pretty good success by actually bolting the trunk together, then applying Vulcam calk to the wound (crack) to seal out bacteria and seal in the tree goo. I used 1/2" bolts with really large...