JNKS2010,
I don't know what your house setup is, but if you have an exterior breaker panel or an interior breaker panel in the garage with one slot open, it's pretty trivial to install a 30A outlet... And if trivial isn't your thing, that translates into "relatively inexpensive" to have someone do it for you.
I installed a dedicated 20A to my prior RV and basically shut everything down other than AC. Our AC would run, but our 20A to 30A adapter would get hot and it was clear that the situation wasn't ideal. I eventually just went with a 30A extension cord and put 30A in the garage...
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