Well actually it was pretty easy. I spent about 30 minutes trying to figure out different ways to get the wire to the roof without it showing. If i had mounted the rack back farther i would have opened up the third taillight cover and ran a power cable inside the cab out through the taillight just removing a tiny amount of the seal for the wire to go though. But, what i ended up doing was this i ran my power wire through then engine compartment through the fire wall and out towards the drivers side kick panel. then up inside the kick panel to the dash. After that just run it up the door seal. with our trucks we have a inner lip that holds my wire in place and it is not visible at all.. The way i did it should work similarly on his XJ if i'm thinking correctly. If you want pics lemme know. Here are some pics to get an idea.
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