i have underside lights on my truck. not necessarily rock lights, but definitely light. i put them there for the purpose of having lights if i were to ever need to crawl under my truck at night. and i can do that now with almost no need for a flashlight. also lined my wheel wells so i can change a tire at 3am, again without the need for a flashlight. and of course this is disco raptor we are talking about so theres also color changing lights under there too....... but we all know the raptor is not a good crawler. way too long of a wheel base to be a good crawler so if you plan on following some jeeps up into the mountains, then yes, you should get some. otherwise, not really needed. unless you are like me and have some crazy obssesion with lights.