We bolted a mounting board on the hood to hold a pack. This is a good safe place. In the pack, the most important tool we carry is the socket wrench for the track tension-er. I recommend swapping tracks back at base to get the hang of it. Avoid a lot of work on side slopes or the tracks can come off.
There are the other standard tools, (look through your unit to identify size and type) + pruners and a hand arbor saw but I also keep bee sting, first aid, water, gloves, glasses, sm trash bag(trail ribbon). Etc..
You can also set up PVC pipe to the arms to hold a pick for roots and a rake for rock. We have another small one for pin flags.
The back of the unit where you stand has a hole that we slip chain up through with a small stick as a keeper. This chain is attached to a chain link fence skid with a piece of 30"x5ft plywood with 4" curbs for fuel, water, other tools. This works like a cheese grater and cuts down high points and fills in low spots. We work a segment, then hook the unit up and move fwd another few hundred feet to the next hand finishing behind. Saves a lot of time back and forth.
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