Running power through back wall of sleeper

Without more info and x-ray vision, not likely to work. The few sleeper back walls I’ve looked at have horizontal bracing at least at the flattop roof line. (Yes, in a condo height as well.) some at the belt line half way up.

Strip the interior and look.

 

Get some wire hider track at the depot and stick it to the outside. ?

 

Don't drill holes anywhere on the back wall or roof of your truck if you can avoid it. Go through the floor and then up the back wall outside. Plenty of ways to do this cleanly.

What rig? A pic would help.

 

Excellent advice. Hit the nail on the head.

 

They sell grommets that when you drill the hole you drill the right size for the grommet.

I can't remember where I got mine.

Silicone the grommet and you're good.