I have an old 4WD Landcruiser with a winch on the front. I use the winch. It has a steel cable rated at 8,000 lb on the drum. The cable can get a bit curly, what with being wound on the drum all the time.
I am looking at a replacement car, to which I would need to add a new winch. The new winch would be 2013/2014 vintage: modern. It is not cheap. However, it is available with a Dyneema rope instead of steel for an extra $400. I have been assured that the Dyneema rope would be stronger (for its thickness), lighter and would not curl.
Sometimes, when I see people using Spectra and Dyneema tent guys rated at 200 - 400 lb, I do wonder whether they have ever thought about how much load their tent or tarp could take. Ryan's study on this Storm Resistance of Ultralight Shelters: Part 1, Introduction measured forces below 10 lb on the guy ropes in bad weather. Will Rietveld' study on Tent Stake Holding Power found that most stakes would only hold 40 - 60 lb loads in common soils. (5" stakes were awful, 6" stakes were fair, and 7" stakes were getting good.)
Me, I use a 0.6 mm Spectra kite line for my summer tent.