The load shedding algorithm is tailored to each RV model, plus there were two different systems in use in 1997, so I'm not sure what order yours get shed in. Do you have a display that lists several items with indicators for each, e.g. water heater, fridge, front & rear a/c, etc?
The water heater will suck about 12 amps when its thermostat kicks in and the fridge in electric mode uses several amps too (depends on fridge model). And if your batteries are discharged or in poor condition, the converter/charger will suck more amps trying to charge them. Adding that and other smaller loads up, there may not be enough amps left to power even one a/c, which takes about 22-25 amps to get started and 11-12 amps to keep on running. Two a/c are almost out of the question on 30A. Try putting your water heater and fridge in LP gas (propane) mode and see if you can get one of the a/c's running.
Other things you probably can't run at the same time as the a/c would include an electric fry pan (10 amps or 1200 watts), a toaster oven, hair dryer, and other high wattage devices. You can count either amps or watts (30 amp supply = 3600 watts), but you have to live within that power budget. Watts = volts x amps, so on 120v shore power each amp of power consumption is 120 watts (120v x 1A).
Your generator probably produces somewhere around 5000-5500 watts and likely has a special circuit to supply power to the second a/c. That's why it can run both when shore power cannot.
