The math is actually pretty simple. There are two parts, rolling friction and lift.
The rolling friction would the same force to move the tractor on level ground. I can push my 3000 lbs tractor on concrete. So I would guess a very conservative estimate to overcome the rolling friction is 500lbs of force. I think it will be lower but not too far off.
The force to lift the tractor into the trailer is 6000lbs x 22inch rise / 72inch run = 1833lbs. This is the force to overcome gravity.
The sum is 1833lbs + 500lbs = 2333lbs
Watch the rating on winches. Winches are rated in pounds of the item being pulled not the actual force they produce. I really don't think a 10,000lb winch can dead lift 10,000lbs straight up.
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