My ideal RV charging solution would be small generator with a built in quality battery charger. It would sense the state of the RV battery and auto start and stop as needed to keep it in a working range. Because it would be a charger only, it would not even need an expensive inverter to supply AC. It would take standby and starting power from the RV battery. Just hook it up, turn it on and let it manage the battery.
2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4
Former owner of a 2002 Coleman Niagara GTE