Many of the newer units (my '03 included) have a double 50 amp breaker for the main. So hooking up to the 50 amp receptacle brings 50 amps to each side of my panel. When I use the 30 amp cord or adapter it brings 30 amps in to feed both sides. I have installed a couple of receptalces on the other side to help utilize the available power. I put 1 in the kitchen so I can plug in the toaster or an electric heater.
I also use it whenever possible (even at a 30 amp site) because the heavier wire has less resistance than the smaller one so I do get a little more amperage this way.
John
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