It's probably 10ga, which is legal for 30 amps
But normally used for short runs inside structures for things like water heater , a/c etc..
With over 200 ft total run, this probably should have used 8ga
Problems arise when things get hot
Once the a/c is hot and the RV is hot, it's very hard to keep the a/c compressor running
To night turn on the a/c and do Not turn it off until breakfast
Switch it to fan for breakfast then right back to full cold after
Do not set it to cycle on off, if you get too cool crack open a window
Eat a cold lunch or used the cook top , order pizza, or goto Mac shack
Do Not Turn off a/c to have power for the mw or coffee pot
Once compressor get hot and the system pressure rises, low voltage restarts are a death kneel, keeping it running Not cycling is the only way to keep it going
I know sounds extreme, but when you have low voltage and extreme heat, that is necessary action to avoid your shut down problem
When temps drop 20 degrees , you will be back to normal operation