If it's plugged in all the time, watch the water in the batteries. The convertor can overcharge them and in effect boil the water away. Use distilled water.
Be aware that the system will also charge the chassis battery (under the hood), so check it if possible. It may be a "maintenance free" battery and you won't be able to remove the tops to check the water level. If so, don't worry about it.
You probably already know to leave the coach's battery disconnect on so the convertor will charge the batteries.
Adding to the previous post, it's best to drain the generator's carburetor after the periodic running. It only takes a screwdriver and is easy. If you put Stabil or another stabilizer in the gasoline and run it monthly, you can get by without draining it.
I always take the batteries out of the smoke detector and TV remote. There’s no point in using up the smoke detector battery if no one is in it, and the remote can be ruined if the batteries leak.
You can leave the refrigerator running on auto, which will then operate on electric, if you like. Some on this forum say they leave it on all season, some don't.
2011 Sunseeker 3100
1997 Pathfinder Toad