Looked at 2016 Jay Flight with 6 gallon hot water heater. My first camper several years ago had a 6 gallon heater and we got by with it but did have concerns. Since then we've had doing but 10 gallon tanks.
Are the new 6 gallon heater better than the old heaters or should I keep looking?
6 gallons works for me just fine but I don't take long showers or do three meals of dishwashing either. Without knowing how your system is being used, I'd guess answers are going to be all over the place.