Those 'orange' extension cords are rated at 15A at best... Running an A/C on them at best will trip te breaker - at worst will cause a voltage drop that can damage the A/C...
You can get away with an 'orange' code if you don't use the A/C, nicrowave, or a residential fridge... It can run the converter, RV fridge... but would still keep the lengths short.
Best is what you are doing - install a 30A (or 50A) outlet - and as Jamie said, use RV extension cords.... The price of the 50A cords may surprise you... for your rig, 30A is more than ok - and much cheaper... and adapt at the house to the 50A if that is what you have installed...
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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