I have seen many chainsaw holders built out of plastic cutting board material. They make a sleeve for the bar to slide into, and attach it to their spare tire mount.
I just put mine in the back of the Jeep, in it's case, or secure it to my storage rack.
Fallen trees across trails are common here in the PNW in the spring. But, I get the most use out of my chainsaw by always returning to camp with a nights worth of firewood!
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