Based upon the comments, I need to add some information.
I do have two generators. One is a 3500 watt inverter genset which will not handle the A/C and a 5700 watt contractor genset which will handle 220 volts 30 amps, but is wired for the RV to 110 volts 30 amps and will handle the A/C and all other electricity needs. The inverter genset is supposed to be quieter than the contractor genset, but to me they both seem to produce about the same decibel level under load.
I originally used the term volts in my original post when I meant watts. Chalk it up to ignorance on the subject.
I understad from the posts that I can't use the two inverters together, so I will have to use the 600 watt one or get another one to handle up to 1200 watts.