Is it possible?
Are there problems when doing so?
Would they both charge at full capacity if demand required?
I'm thinking a smallish engine driven alternator, 40-50 amps, and a driveshaft driven larger alternator 60-80 amps that connects to trunk mounted battery.
This configuration;on would be appealing to me if they would "get along".

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.