[C&P RV]

1st and most important - I am not an electrician!
But, I don't think trying to connect 2 generators via a dog bone will work. The neutral side of a 50A circuit is "shared" between the 2 hot sides. You are trying to share the neutral with two devices that aren't synced. The parallel kit for the generator does that for you to provide additional wattage.
The Predator produces 25 amps (3000 watts) constant load and peak loads to 29 amps (3500 watts). I've seen videos of people putting a constant load of over 3500 watts with no issues.
I've easily run one AC, ceiling fan (ac), and the converter on mine with zero issues. That was my 2014 3850FL. The 2022s all have the Q Series AC units which only draw about 8-9 amps running and 14 amps at startup without a soft start. (readings taken from my SurgeGuard). I plan to try to run 2 ACs, started a few minutes apart, with all other power draw including the converter switched off to see if the Predator will hold the load. If it browns out the SurgeGuard should kick in and cut everything off.