I run a 9500lb winch (chinese Ebay job) and it pulls me out of ANYWHERE. I usually use a doubler block when I have to save patrols, luxes and cruisers.(Which happens all the time

)
I've pulled over a dozen cars up some serious rock ledges without drama.
If you fit a 6000lb unit you will surely overload it pulling someone else other than a Zook.
Jas.