As an offshoot of the winch idea and as a way to save weight I would suggest researching lightweight stronger than anything rope. Particularly the type used on sailboats that is designed to hold incredible loads. Check it out:
http://www.layline.com/llf/llpages/h...riga/page2.htm
Just an example:
1/8" diameter
.6 lbs/100 feet
2200 lbs break load