For 'primitive' camping you need to either do without the usual 'conveniences' as Lynn suggested . . . . or carefully think out your 12 volt systems
LED lighting makes the most of your available power - A 12 volt LED light can consume roughly a tenth of the power that an equivalent incandescent light would use. They cost a little more to buy, but on the plus side, they last just about forever, so you won't have to be buying replacement bulbs
Some sort of fan to move the air around would be almost an absolute necessity to my way of thinking. They make the Fantastic Fans which are thermostatically controlled (the model 5000) and they turn on and off automatically, based on the tempoerature you select. They also use about as little electricty as anything you can buy, though they are fairly expensive
A good deep cycle battery would be a good investment (like maybe an Optima Yellow top) with a way to recharge it off the tow vehicle. Many folks (me included) will use a solar panel to recharge it during the day. I bought a 15 watt unit perfect for the top of a tear (because it's thin and flat) from Northern for $80
If you've been a tent camper all your life and you don't really miss lights, fans, refrigerators and the like, it's not that important to include them all in your tear, but for the rest of us, it's at least something we should consider . . . . before the tear is completed so we can make some allowances here and there for the 'modern conveniences'
Don