there are. in fact. several solutions to that problem
one is a cord winder. another This is a device patterened after a pitching machine or tennis ball machine used for batting/tennis practice. Only instead of spitting out balls it pulls in the cord which then coils in a TUB much like what many above show.
A Cord REEL like a hose reel (I do not care for these)
There is a type of cord I call a "Super flex" it has a different (Plastic I think) jacket instead of the one that gets real stiff in cold weather. Also the strands of wire are both thinner and more (more strands thinner) so it flexes very easily.. I have a 30 amp cord for my Rig (Currently in use) made of that stuff. Coils as easly at 20 degrees as at 80.
Check with your RV supplier for ready made "Super flex" cold weather cords.
This is an example at home DepotAlso a shorter cord (The one above is 15 feet) makes it easier to wrangle but you may need an extension cord with a short cord. Those alos come in assorted lengths.. I googled "Cold weather 50 amp rv power cord" by the way.