The winch on my trailer is fitted with thin wire rope, about 5-6mm I guess, which is "not in factory condition"....
I am thinking about trying to get hold of some "plasma" type synthetic winch rope, as often found on competition 4x4 winches these days, I use "Dyneema" (one of the variations available) on the winch on my Defender and it is magic stuff, really strong for its size, very light to use, doesn't whip if it breaks, dead easy to splice, and you can mangle it up on the drum as much as you like criss crossing the layers and it doesn't mind at all
The stuff I use on the 90 is 10mm which is something like 22,000lb breaking strain, but for this role I guess 6mm would be ample, if I can find anybody selling it in that size.
Is anybody using this? I believe the stuff was originally developed for racing yachts or something, so I can't see any drawbacks to using it - it shouldn't be bothered by salt water?
Edited to add I've just found one of the suppliers selling 6mm - 3220kg breaking strain
Long mooring lines - where required - might be another use for it - though the price would be offputting for that.... (even the 6mm is £2.90 a metre!)