Remember seeing these Hub Winches in an old Jack Jackson book, old mini brake drums (mounted inside out) or mini wheels bolted to Landy rims with rope around them, just drive out as you say.
Apparently the rope from one hub "should go through a karabiner or shackle and back to the other hub; in this way any change in rope length due to one wheel slipping is self adjusting" (The off road four wheel drive book by Jack Jackson pp47/49, published 1988 - ISBN 0- 85429-673-5)
Andrew.
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