We too usually walk about and like to leave the campsite cold when we do so that there are no surprises when we come back, i.e. burning your TT down. Kim's night vision isn't all that good and she really could use a night light at the steps. So, what I did was install a blue led light strip I bought at West Marine just behind the steps and fished the wire through the floor to the wall just inside the door where I installed a mini rocker switch. Power washed not a problem as the porch light switch was just above the location of my new switch. The current draw on the LED's is so low, that I can and have run this night light all night and not even notice it on my coach batteries in the morning.
As far as running all the exterior lights at night, I wouldn't just from the fact that we always dry camp and I have to rely on the coach batteries. I have not changed my exterior lights out for LEDs yet and the power consumption of the incandescent bulbs is much higher than the LEDs.
I'll take a picture tonight of the night light and post it so that you can have a better idea. It really does provide quite a bit of useful lighting.
Bob and Kim
1995 Jayco M-294FL
Sea Ray 187
2 Dogs, 2Cats, 4 Kids and 1 Grandaughter:D
1979 Winnebago Brave 28
1976 Jayco Wren PU