Although not commonly adopted it is possible to loop the wire from a roof light bar.
How to wire roof rack lights.
If your lights do not have connectors included strip a half inch of bare wire from the end of each power wire using your wire strippers.
Slide each end in a crimp style wiring connector.
The cabling is run along the length of the roof attached to the roof rack or rail and in the case of a ute will generally loop across to either the sports bar or headboard of the tray itself and head down to the chassis rail then off to the engine bay.
Jeep cherokee roof rack install by the newerejk jeep duration.
Ask an expert wiring roof lights duration.
Some roof rack manufacturers may have optional light bar mounting brackets like this rola titan roof tray which makes installation as simple as spinning a few spanners.