Yes, there are many Winnebago's that are only 30 amp and have 2 AC units. You won't be able to run any other high amperage draw appliances such as your water heater or microwave/convection at the same time.
If you have an Energy Management System it will automatically shed loads to keep you at 30 amps. You can set your EMS to shed in whatever order you desire.
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I suppose it depends on how much current your particular units draw. We can do it if everything else is on propane (or turned off). In our case our EMS shuts everything else down. We have done it on a number of occasions. When the two compressors are cycled on the current is around 26 to 27 amps. We haven't had any problem with low voltage yet but the surge guard would shut it down if we did. Keep an eye on the voltage in case it gets it starts to drop below that 115 zone.
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When I had my Winnebago gassers, I could run 2 AC's on 30 amp service because of the EMS unit. I found that with both AC's running, I was drawing about 24 to 26 amps. However, when the AC's would start, the EMS would only allow one at a time to start due to the high start up amperage draw.
I can remember one extremely hot day in Arizona. Both AC's were running full speed when my DW started the microwave for lunch. That was followed quickly by my daughter running a hair dryer. Suddenly, the AC's were blowing warm air because the EMS unit cut out both compressors. When my wife finished, one AC compressor started up, and when my daughter finally finished, the other compressor kicked in.
So, the bottom line is that with a good EMS system and with a gasser, you can run both AC's on 30 amp service.
My DP has a parasitic draw of around 6 to 10 amps, so I cannot run both AC's in my present coach on 30 amp service, even with a good EMS system.
Out West Somewhere
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Yes you can, BUT I would try at home first with a 30-15 adapter and a kill-a-watt. Trip the breaker on the converter, turn off the electric water heater, ptu the fridge on propane, and make sure you are REAL close to 0 amps. start on ac and measure the amps, then shut it down and repeat on the other one. Add together, and if less then ~30 you are fine. Note, if both compressors start at the same time you are toast. I would start the larger (amps) ac first, so the surge off the other one is as small as you can get. I would also just run both to cooldown, then shut one off and restart the converter, fridge to auto.
It's probably why your rig has a 50-amp power cord. Running 2 A/C units on 30-amp cicuit breaker, not going to happen on this planet. If the 30 amp breaker holds, which I doubt it will. Your going to have low voltage to both, which means the units will be running a higher than normal amps, which is not good.