Believe it or not there are tens of thousands of rigs who's owners would never dream of not plugging into 50-amp power. Their batteries go bad every year or so and they chalk it up to maintenance. This folks are the sole target of RV manufacturers who lavish genuine poly vinyl chloride walnut look alike cabinets with faceted plastic glass and push-a-button lifestyle. Lile I quipped not long ago if these knotheads could manage to cram a bidet into the bathroom and insinkerator garbage disposal inder the sink they'd do it.
A converter has no glamour so the-cheaper-the-better. RV manufacturers argue to the death with vendors over a nickel and have bouncers in assembly areas to keep Mexicans from knifing the Nicaraguans...