Actually the sewer light is helpful. Traveling in mid-November when the sun goes down around 5 and we may stop as late as 6, it is bright enough to help in attaching the sewer hose.
I can't imagine how the jack light can illuminate anything worth seeing.
Flashlights still needed to see things anyway when we are setting up in the dark. The ones that fit on your head are cool. They remind me of miner's lights from my long ago days in the mining business. You always have to be careful to not face someone when you are talking to them because when you look at them you are shining a light in their eyes.
I have an LED flashlight that has a tripod and the head swivels, so it can be placed just about anywhere and set to light up things. 3 position switch for various amounts of light too. And, it washes the dishes.