Me either.
I'm about to drill my roof at the back to run a lighting feed to a couple of small light bars. I've found some 2 & 3 pin weatherproof plug & sockets, where the sockets have threaded clamps and decent looking rubber glands. I'm thinking drilling, paint and silicone, shouldn't go far wrong...
Where did you get the plug/sockets from Clive?
What I have is something like this
Just a suggestion for those running snorkels and wanting to run power up to a roof rack, we enter the back of the snorkel head and use a grommet to make it neat and sealed as such, and then in the engine bay exit the snorkel and carry on to you switching and/or power source.
The cable sits nice and neatly in the gutter channel to the first rack leg. We have even spliced in one of those connectors so the rack can be removed anytime without cutting the cables.
I can post pix if y want, but I'm sure y get the idea.
Just a thought to save drilling your roof.
Cheers