For the past 3 years we have had our 30 amp system hooked up whenever we are home.
I have a adapter into contractor grade 12 ga extension cord into a power strip
in the garage.
This runs the converter, the refrigerator, a battery maintainer for the chassis battery and I have run the A/C without problems.
In the winter I have a 1500 watt electric heater to keep things from freezing
as I only do minimal winterizing. This has worked down to 6* so far.
If I want to run the furnace that works also.
Searching your documentation on the appliances will show the amps each takes.
Just stay in a safe area of usage.