Are the A/C & microwave bigger units on this trailer? The manuals should advise the wattage or current draw for each unit. Bear in mind there may also be other major electrical draws like the water heater, battery charging, lights. Add them up and see if you will exceed 30 amps. You might try turning off the water heater breaker and running it on propane. Switch the frig and water heater to propane when electricity is at a premium. If everybody did this it would make the electric feeds less troublesome during high heat summer days.