You will need to plan for approximately 1,800Watts for each of your 15k A/Cs, equaling 3,600 total Watts.
Think about the need for power to your other appliances, such as your water heater, your microwave and your refrigerator. Perhaps you have a converter/battery charger as well.
Then plan for whatever power management you are ok with.
The really good news is you will not require any extra generator capacity for the startup of your 2 A/C units since 2 SoftStartRV units – one on