I leave my RVs plugged into shore power all the time. Never an issue.
When I used trailers or pickup camper I didn’t bother. They charged on first trip.
My last three rigs (pickup camper, Class C, and Class A) have generators which I run once a month if stored for more than a month.
Now retired so rarely leave RV more than a month. Death Valley after Thansgiving and then south again forca couple months mid January.
I get a lot of practice winterizing, though.