Technically, you can pair any two gensets of identical voltage.
Yes, you add the amps together and multiply by the voltage to get the total power available.
I've done the research on how its done. VERY MESSY!
Unless you REALLY KNOW what you are doing, stick with the parallel cables sold by the manufacturer and pair only similar gensets.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!