Some RVs have standard converters that put out about 13.6 VDC and others have the more expensive multi-stage converters that have 3 or sometimes 4 modes. Bulk charge at a higher voltage, normal charge, and float mode.
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
2014 Thor Palazzo 33.3 with a 2007 Tahoe toad