Hi cary and Beavergirl!
Bailey's and Madsen's also carry the
Simpson, at about $400, just add saw powerhead.
Here's an old post I made:
Simpson Winch folks recommend using 3 strand on the capstan for better holding power. I dont have any, but do have a 0.5" 10000 lb tensile double braid that works pretty well. If you fill the capstan with wraps, it will not slip if held tightly. In a steady pull situation, I'd guess that a SWL factor of 5-1 would be acceptable stress forces on the rope, so that would be 2000 lb of pull.
I have used it to be pulled up in a tree, have lifted appx 750 lb tree pieces off houses, tip tied and lifted a hung 90 foot, 17" dbh cherry til it could be cut off the stump then butt chunked down, used as quick lift for long limbs to get them onto a speed line. I used an old 1/2" Arborplex (kinda slippery) to pull a willow out of a lake, piece by piece. We had a redirect block up 10 feet, best we could achieve, still made it hard to get up the lakeshore.
I modified mine to allow it to be bi- directional, however it is good to have a portawrap or other backup, as it doesn't work too well (motor shut off) as a lowering device. The wraps have locked up a couple times, which can be rather disastrous.
For straight pull applications, a traditional wire rope winch would be better. But I know the Lewis winch is poor quality. I have seen two very high quality products, one of which is the Solo, which is not imported to NA. The other, at ~$1800, I have not wanted to spring the $ for.
Here's a recent pic of us using it on a pretensioned elevated tight line to yard big brush piles up a steep hill. 044 with opened muffler providing gobs of power!