do you need this NOW for a site where your existing cord can't reach, or is this just a question about having one 'just in case'?
50a cords are heavy and expensive... stay away from carrying one unless you for sure you know you will need it - the expense will probably cause you this thought to begin with. We've traveled A LOT, for over 80,000 miles, and to Canada and Alaska, and I can't ever remember needing an additional 50a cord(my 50amp shore cord is already 30').
IF, and I say if, you really are 'concerned' you may not somehow be able to reach a 50a shore power pole, you can also purchase a 30a extension cord instead - at least you can then reach the power, but be settling for 30a instead of 100. In temperate weather, 30amps is plenty anyway. Very hot, and Very cold weather are where you really need 50a(100) when running multiple AC units, or a lot of HEAT(especially electric heaters).
You'll be fine. Don't sweat it.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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