eldel wrote:
OP here - just got chased out of Wyoming by the snow :-)
Thanks for all the input. For clarity the previous RV (TT) AC would run happily from the 15A house circuit. The replacement (C class) AC trips the breaker in about 20 seconds. The 14-30 is not the dryer but a separate circuit that we put in to run a table saw. Which never happened but that's another story.
It looks like the easiest answer is to replace the 14-30 outlet with a 14-50 one. Failing that I'll buy an adapter from the ev place.
There's a direct adapter on Amazon I posted previously:
https://www.amazon.com/AC-WORKS-Generator-Adapter-4-Prong/dp/B07WN9ZZ6W?th=1I agree that swapping the receptacle is the easiest/cheapest way to get what you want, provided you no longer want the 14-30.