After a year, the 50 amp cord that came with my 5er did the same thing. I ended up purchasing a Camco 50 amp (yellow) male plug to replace the one that was pulling.
The second thing I did was purchase a new 25 foot 50 amp cord.
The third thing I did was purchase a new 50 foot 50 amp extension cord (4 prongs one end, 4 on the other end).
I thought I could use the new 25 foot cord and if needed use it with the 50 foot extension.
But, after I replaced the stretched one with the Camco 50 amp yellow end, I decided to just continue using it instead of the new ones. But I changed my method a little.
Face it, that cord is extremely heavy. To take some of the weight off the end of the cord where it attaches to the plug, I simply re-routed the wire like this. I do similar at campgrounds now too. Sometimes I do have to pull out the 50 foot extension to relieve the weight off the plug itself, because the distance from the power told to the back of the camper is just too far. But his has worked quite well.... using the Camco yellow plug. (see photos below):
Linear Mode
