I’m afraid I won’t be the one to bring you good news. I’m going to presume that your RV can also be hooked into a 50 amp outlet and that you have no issues operating both air conditioners when plugged in.
I’m also going to presume that your RV doesn’t have an Energy Management System (EMS), that you tried to operate both air conditioners on the 30 amp service, and that you tripped the circuit breaker at the RV park’s electrical connection.
In most circumstances, an RV connected to a 30 amp circuit will not be able to power both air conditioners. A good rule of thumb here is that the older the RV and the bigger the AC units are, the less likely you are to be able to operate both ACs on 30 Amps.
You may operate two AC units on 30 Amps in certain newer model RVs with more energy efficient AC units as long as you don’t try to run additional electrically demanding equipment like a microwave, hair dryer, electric heating element for a water heater, and so on.
Even some contemporary RVs with Energy Management Systems (EMS) are unable to operate both air conditioners at 30 amps.
An Energy Management System, or EMS, is a system that automatically manages the appliances in your RV to keep them below the power limit. If you use your air conditioner on a 15 or 30 amp circuit, it will switch off (shed) other appliances to avoid tripping the power source’s circuit breaker.
Some RVers have altered their electrical systems to allow one of the air conditioners to be hooked into a separate 15 amp outlet (if available). However, I will not go into depth about this since it involves changing the RV’s factory-installed electrical system, which, if done wrong, may result in fire, shock, serious harm, or death.
I realize this isn’t what you wanted to hear, but at least you now know it’s typical and not a sign of an issue with your RV.