I went another route and bought the Hughes Autoformer RV220-50SP that is both a voltage booster is surge protector. A bit pricey, but I have been at way too many campgrounds with low voltage. It's not a permanent install, so I can move it on to the next motorhome. Here's a link with some information:
https://hughesautoformers.com/produc...ter-and-surge/