Chuck, your pictures make the point so well. Mel posted a link to an article
here last year which contained this picture:
I've changed my thinking about power cords and connectors. Here's the bottom line for me. With low voltage connections at campground pedestals being a very, very common occurrence there is no wiggle room. This problem is additive and self perpetuating and once started it
will end in failure without intervention. To avoid problems like these we have to make sure all of the connections in our coaches and power connectors are maintained to perfection to prevent the bad power, which we are certain to encounter at the campgrounds, from over heating any of the connections in our equipment. Inspect your connectors often for signs of corrosion or over heating - once it starts it must be fixed or it will grow. Replace plugs and sockets in pairs along with 8" of wire. And, I'm now convinced that the Marinco system is minimally adequate and only when maintained perfectly. The Smart Plug system is better insurance.
Here are my procedures for connecting and disconnecting shore power:
1. Turn off all high current heating and cooling appliances
before connecting to shore power (i.e., converter, refrigerator, water heater, AC, furnace, space heaters, etc.). Don't do this at the main breaker - unless there is no breaker available at the pedestal; then you'll want to use the BF's main breaker to prevent arcing when connecting your power cable between the BF and the pedestal.
2. Make your power cord connections
before turning on the pedestal breaker to avoid arcing at the connectors which can burn and pit the contact surfaces..
3. Turn on heating and cooling appliances sequentially to avoid an instantaneous full load.
4. Turn off power at the pedestal breaker before removing either end of your power cord to avoid arcing.
5. Turn off the heating and cooling devices' switches so they're ready for the next hook up.
Mike
that Marinco had assumed the responsibility, without investigating, for the factory's mistake and the factory seemed unconcerned and was pointing fingers at everyone else. But it did explain a lot of borderline issues I'd been having for the first several years and it has worked great since re-instilling my faith in Marinco products - until I saw yours. We were actually pretty lucky - it had the potential to start a fire. 
