The problem with coiling a cable or extension cord is that it forces twists in the cord. There are two methods that avoid this, the Roadie Method and the Daisy Chain or Braiding method. Both are described and demonstrated in videos
here.One of my previous RVs had the 30a cable stored in a closed area with only a small hole where the cable came out. To stow the cable one had to push it all back into that small hole. Two tricks I discovered with it were to 1) always pull all the cable out before trying to stow it and 2) give a slight twist to the cable about every 3 feet when stowing it, alternating clockwise then counterclockwise.
BTW, both the Roadie and Daisy Chain methods keep the cables from getting tangled up when you want to lay them out. The Daisy Chain method works great for long cables and welding cables since you can tug on one end to get as much extension as you need without undoing the whole braid.
