not exactly sure if replacing with stainless steel but i am currently re rigging my rl28 with 5 mm dyneema
it seems a modern choice
discussion here
https://trailersailerplace.com.au/phpBB3/viewtopic.php?f=12&t=15011&p=178508&hilit=tumbleweed#p178508
specific to rl28
https://trailersailerplace.com.au/phpBB3/viewtopic.php?f=68&t=10032&hilit=tumbleweed&start=125