The amount of mis-information when it comes to 50 amp circuits in threads like this is amazing and nom, I am NOT going to try and set it straight.
Old Scout talks about 30 amp cords being damaged by running near max for extended periods
I have two cords. completly different cords, one 30 one 50 On a 50 amp site I use the 50 amp cord, I do not use a dog bone (RV is 50 amp) on a 30 amp site I use the 30 amp cord and plug into a 30 amp outlet (there is no 50) and yes, the plugs and extension cord outlets have melted I've had to replace them all.. This is because the TT-30 plug/socket is not capable of true 30 amp service in most cases.. I also noticed it is the NEUTRAL side that usually melts.. WHY.. Not pure copper that's why.
On most outlets the neutral is a "Shiny" metal more silvery in color, the HOT lead is copper colored.
Home is where I park it!