Logging is a dangerous profession no doubt. Just from the nature of the job. My dozer came with a choker cable. Even in my prime I wouldn't want to set chokers all day, no way, even if I was physically fit to do that.
It would have very interesting to watch the steam donkey in use. A bygone era.
I expect the dozer I have has always been in logging. No way to know for sure, but being a wide gauge model makes me think that. If it was in logging very early it would have been used before chainsaws. Kind of cool to think about. 

One of my planned uses for the winch besides pulling firewood off a hillside is cutting some tall trees that are leaning toward my cabin. I want to use the winch to drop them in the right direction, and not on top of the dozer. I think I'll have a little more cable on the winch than some of you might. I have dropped 2 with my Bellview winch doing the pulling and it worked well, but was a little cumbersome locating truck and trailer. Since the winch is mounted on the trailer. The dozer should make this easy. Only issue is it doesn't run...minor detail!

what you you can do is have a straight cable made with eyes on each end to use as a extension rope that you put around the fork of the tree and then run that to the winch this gives that bit extra distance away. we have dropped trees that way with wheel tractors.

the big thing is getting the timing right with the person on the saw.

I was thinking I would use the choker up as high as I can get it. One thing I don't know is how fast the winch pulls. Fast is better, and an empty drum is stronger but slower.

If you want fast, set the winch brake, put winch in neutral and drive the tractor in whatever gear you want.
As stated above, a separate strap or line for these situations is the way to go, that way you don't have to fool with it all the time, it's stored out of the way and will last for an unlimited amount of time, unless you forget where it is, let it get overgrown then run it over and get it all tangled up in the undercarriage.
I have cable straps from 1/16" up to 1-1/8" plastic coated yarder cable (that stuff is never fun) they all get used, but for most uses the 1/2" strap does the job.
If it were me, I would use a 75 foot 3/4" bull line, 5/8" chokers, a couple different sizes, and a 75 foot 1/2" strap.

In my experience, setting a cable as high as possible up a tree when pulling them down isn't always the best option. It's about finding a nice balance and cutting an appropriate scarf and back cut. The higher up the tree you attach your cable, the faster you need to pull the cable when the tree starts to go.

It's a topic for another thread, but to touch on the early cable logging machines after steam, I am in the possession of an early D8 and triple drum Hyster Yarder winch that was used in early cable logging in my part of the world. It's a near future project.

Hi, D8Dude.
C-mon, Man. You CAIN'T just leave that hanging out there. 'Fore-n-nafter' photos, wottz to be done, when, how?????? And the list goes on.

Just my 0.02.

Yes, you're right about the higher up the pull is, the faster the line speed is preferred. I was planning to use that heavy choker cable hanging on the dozer blade in the picture.
   
That is not going to be easy to lift all that high. I also plan to practice with the winch too. I don't want any surprises.
All this cold wet weather here in Oregon has put a damper on working on the RD4 for the time being. I need a few dry days....

Sorry, not sure how I got the double picture in there.