Drilling through the roof and i stalling one of the bulkhead wiring connectors with a single loomed connector with all roof rack lighting so it can be quick disconnected at one central location and at each independent light woukd allow removal of rack without messing up wiring or looms or having to remove wiring and lights to remove the rack.
Wire roof lights.
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Although it is indeed possible to wire the lights directly to the positive and negative battery terminals installing a complete electrical system into a diy camper is going to involve moving the branch circuits lights fans usb outlets etc away from the battery bank.
The l line also known as live or phase is connected to the first lamp and other lamps are connected through middle wire and the last one wire as n neutral connected to the supply voltage then.
Although not commonly adopted it is possible to loop the wire from a roof light bar into the back of the snorkel head.
Once it is in the snorkel head the cable will run down into the dirty side of the airbox and will require drilling through the side of the airbox to penetrate the wiring back into the engine bay.
Adventure further and explore off road lights light bars roof racks and adventure products for jeeps trucks suvs utv atv.
To do this i recommend using a power distribution center like the wfco wf.
Partsam 3pcs smoke cover lens white 30 led cab marker roof running top lights assembly wire pack compatible with silverado sierra 1500 1500hd 2500 2500hd 3500 2002 2007 truck 4 1 out of 5 stars 80 52 01 52.
In above fig all the three light points are connected in series.
Find out how to wire roof mounted spotlights on your 4x4.