Not being an arachnologist and after searching the internet, I believe this is a silver garden orb-weaving spider also know as the silver argiope with the scientific name Argiope argentata.

She was on the electric pedestal at our current RV site. It’s a she because of her size. Glad I was very careful to avoid her her when I plugged in the the power cord. Turns out she eats the male just like the Black Widow does.