It does take some planning to be successful...
You need to change over to LED lights and install more batteries. Most campers that camp off the power grid like to have around at least 220AHs of battery capacity.
The planning should include not letting your battery drop below 12.0VDC which is around 50% of battery state of charge between re-charges.
We have done a few things in the trailer to save power but the main thing we did was make sure we have a smart mode converter/charger on-board and be able to connect the trailer shore power cable to a 2KW Generator. This allows us to do alot of things in the one day/night run off the batteries with the thought in mind to re-charge the next morning during breakfast using the generator to run the trailer. This requires a RV30A-15A Adapter (WALMART) to connect your shore power cable to the generator 120VAC receptacle. Usually you allowed to run your generator at most camp ground for a few hours each day. With smart mode technology this only takes three hours aday to run run the generator.
You can also add solar panels to supplement this idea as well...
We have been camping off the power grid doing this method for over five years in our OFF-ROAD POPUP trailer.
Works great for us and by following the never dropping the batteries below the 50% charge state before re-charging keeps the batteries going for a long time. My batteries are over five years old now and still going.
Here is a simplified 30AMP electrical configuration chart showing what is on 120VAC and 12VDC that might help on what is powered by what....

Without planning every time we ran to the woods camping off the power grid it always got dark on us around 10PM each night...
Roy Ken