Keystone 27' TT Honda Paired EU2000i Gens Help

The simple answer is you are trying to pull too many amps for your combined amp draw with all the devices you have on along with the AC. Turn off everything except the AC and see if it still trips.

Some report success with adding, or replacing, a quality Start up Capacitor but I really don't get how that impacts the running of the AC after start up... Some claim it does.

If you want to run all those items simultaneously, you may need to get a larger generator.