Picked up an old school 1989 DR Brush Mower. It has the original 8hp Briggs motor. No problem cutting anything I wanted it to. Anything bigger would be easier to use a chain saw to avoid the mess. No reverse, very heavy, noisy, and not good traction. I believe its best for flatter ground and stuff like sticker bushes and sapling patches, stuff you dont want to pick up or handle. Using it for grass or small trees would be waisting time.
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https://www.youtube.com/watch?v=8WDw2MMKxZc
Some crappy footage of a buck I shot, not a big rack but definetly a big bodied deer. On the scale it was 175lbs dressed with the head still laying on ground
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https://www.youtube.com/watch?v=s3mW7jGBk08