We can get by just fine with our 255AH battery running the lights and home entertainment items etc...
I have a 2kw Honda generator secured in the tail gate corner of my truck but the only time I run it is the mornings when allowed to charge up my battery bank using the on-board converter/charger in the trailer.
This is when we make up our fresh ground bean coffee for the day pored up into a thermos as well...
Sometimes when parked at a WALMART overnite we hear a couple of generator running- These are from those big trailers with built-in generators. I have run mine to make some coffee before hitting the road...
A few times when we were really tired we would sleeping in the truck seats and it is fun waking up to kids and their parents walking by the truck and hearing the kids hey someone is sleeping in the their hehe... Then we know we have over slept haha...
Roy Ken