I was wondering why you have extensions on your chainsaw mount? Do you find carrying a chainsaw useful? I was considering carrying one.
I will not ride without my chainsaw. It has gotten me out of so many jams in the woods. I have also got a lot of people out of trouble as well. Often where I ride the trails are in such bad shape that you can't go through. In this case it's nice to have a chainsaw to cut your self a trail around the bad spot. This past weekend I came across a guy on the trail ( brand new Honda Pioneer 1000 ) who got stuck on a fallen tree and couldn't winch himself out. In this case I cut the tree out in sections to take them out. Some one probably could have jerked him out and damaged his machine. But with the chainsaw I saved the day!
If you notice I placed the chainsaw holder behind the seat because I also have the tire holder. This causes the chainsaw handle to hit the back of the seat and not sit in the right position. I added the spacers to give me room for the handle to sit on the bar. It would work with out spacers if you put the holder in the center but I couldn't because of the tire. If you can make out the chainsaw handle in the picture you will understand what I mean. Sorry about the picture, I cover my chainsaw on the trails because I have a battery operated chainsaw and don't want to get it wet.
Everything has a pro and con to it. One advantage of having the spare tire in the bed as apposed to in the rear like DJPAINTER is rearward clearance. I have been in situations on tight wooded trails where you needed every inch behind, you to back up and clear the turn. Usually it's when I'm making a trail around an un-passable trail. This has been the case on almost all of my rides. If you don't run into this scenario then it wouldn't matter.