i did the same thing. we only have one a/c so the need to have the 50 amp all the time isn't necessary. Exception; we have tripped the main breaker at the park post when running a/c and water heater. of course just turn the water heater off.
we also have a transfer switch installed and use a Honda EU3000IS generator. Haven't had an issue other than the need to isolate a/c when turning it on.
as far as the cord, Yeah, Amazon is a good place to check and sure beats hauling the large 50 amp cord all over the country.