The 50 amp cord that came with my RV is a pain (literally) to try to coil in cold weather due to the plastic covering. I actually pulled something while wrestling the dang thing on a cold morning in Colorado last fall, so I ordered this from Amazon: https://www.amazon.com/gp/product/B01K35FZXI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Reviewers say it has a "rubber" covering that remains fairly flexible in the cold. It was relatively cheap at $99 but only 25 ft long vs. the 32 ft I have now, which I don't see as a problem.
I'll try to follow up on this next month once I've had the opportunity to coil it in 30 degree weather.