it took a fair amount of driving with a single "heavy-duty" alternator to fully charge our camper batteries after several days of usage and little driving.
This isn't an issue with the alternator but an issue with the small stock wiring, usually only #10 for power circuit to the connector. You can alleviate this by putting in your own wiring and heavy duty connector for a real charge circuit.
Did this on my Ram with #2 and the most I have seen is about 20A into the battery while providing another 11A to the fridge on DC.
Understand about the electric-shift in a package. On my Ram the only way to get manual is with the bottom trim level and we wanted some features offered in one trim level up so made the compromise. The Ram takes about 10 seconds to shift which would be a long time once you start sliding. Loved the old Dodge with manual shift as I could have it engaged in about a second.