I ordered my first trailer with 50a service, cuz it was only $20 more than 30a service, and bigger is always better, right? But the 50a plug was a pain as there was never anywhere to plug it in, and way overkill anyway. Just go with the 30a rv style cord, they are cheap and plentiful and you can plug in directly most places. And if not the 15a adapter is only about $5 at walmart, so easy to adapt down. The 30a setup is big enough for your future needs and easy to install now instead of changing later. I would suggest just getting a 50' sealed connector rv extension cord and just cut off the camper end and wire it directly to your panel. Cheaper and easier than building the cord yourself, plus the outdoor end will be factory sealed and waterproofed. They are under $50 on ebay if you shop. On mine I looked into using a marine type sealed connection on the outside of the trailer to plug the cord into, but that stuff ain't cheap. So I just have a short cord like I described from the box rolled up in the storage compartment and I just pull that out and plug it into my 30a extension cord. I carry 100' of 30a cord, and that is more than enough to run roof air, appliances, etc. without getting hot.
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