That's gonna be a jump on material price. Anything over 2" in size, thei cost goes up expotentially
Is there a way to use an ordinary come-along or winch of some type?
You can use a choker on the rope a what is called a French prusik. It works on the same principle as a choker but you use a small peice of rope. It's easier on the rope than a choker can be
The link is how to use a prusik. It's a variant of the one I use but it works and simple to usehttp://m.youtube.com/watch?v=u0YxU5C_KrQ
With some type of winch or even with block and tackle one person can feed while one person pulls even with the biggest and longest pulls