OK, so with 3 snatch blocks you can increase your pull to ~14,000 lb however for every 1' you pull on length L, you only move D about 3".
If your can spool 40' out of your winch rope, you can move 10' in D, but that doesn't take into account W. I would guess with 40' of rope you could move about 4-6' with this setup.
My thought was you could increase your distance to the anchor with the heavy blue rope, which needs to be ~20,000lb or greater here.
Of course you're doing a hitch mount and won't have tie points where I drew D-rings, but I guess my point was that rope in a situation like this can give you more L by extension, plus in a complex system would be easier to work with, not get tangled, etc.
But now I realize you'll probably just straight pull from your hitch to an anchor, since you probably don't have other tie points anyway.