I have three sources for camp lighting:
1) The cruiser's lights. I have two Rigid dually diffused lights I use as backup lights, these can illuminate a camp very well, they have an awesome flood pattern and are damn bright. The downside is they aren't always positioned for the task. I have seriously considered adding lights or light strips on the sides of the roof rack (especially under the awning) for dedicated camp lights, but I have never come down to it because of battery consumption and having to be constantly having to monitor this.
2) Inverters: I have two inverters, both small (<500W) that power assorted chargers and a wiring loom with 5 bulb sockets in them. I always bring a range of bulbs with the loom to fine tune the lighting I need.
3) Generator: I have a small, ultra reliable, extremely quiet Honda 350W generator that pack very well in the vehicle, weighs something like 15 pounds and can power the same load as the inverters without drawing juice from the batteries. Better yet, it charges batteries if these were accidentally discharged.
The generator has been my most used solution, one of the main drawbacks is the noise created by the generator, but since it is surprisingly quiet and we only turn it on at night when cooking and turn it off immediately after, it's not really that noticeable. Off course I have to bring fuel and 2 stroke oil for it, but since I already carry fuel for the truck and it uses so little that it's not something that would bother anyone.
I am currently considering a solar charging system for the cruiser, if I can manage this then I will probably stop using the generator...