I missed your PM, 30 amp service will not usually carry 2 AC's, problem is starting is a very high current draw. One running and the 2nd starts will usually knock you offline. OR drop your voltage dangerously low, overheat the cord etc... You can usually run one if you monitor current use. Can't do microwave and AC at the same time. Here is a chart of the usual current needs, if they add up close to 30 you may have a problem. (If you are on that 15 amp adapter one AC will be marginal and will probably pop the house CB)
RV Tech Library - Appliance Load Chart
Some RV's will automatically shed part of the load to keep things running.
A long power cord run will drop the voltage and power available.