So just a quick question here. I have a 1973 Jayco Popup. Last night my curiosity got the better of me and I decided to look up the wiring diagram for a regular round 7 way connector since my Avalanche has one. I knew that vehicles (such as mine with a brake controller) use the 7 way connector but I didn't know where all of the connections went. 4 Wire lights are simple enough but the 7 way I didn't know. So to my surprise I noticed that there was a 12v line in there. According to the owners manual that will power the interior lights of the trailer. My question is, has anyone ever used their vehicle to power the interior lights? I'm only intrigued by this since 1. My power converter is shot. (We're considering adding a battery to the pup and setup a charging system from the truck to the pup. My father in law is a mechanic so he knows how to set this up properly) 2. We don't camp at regular camp grounds. We like to go up into the woods with our ATVs and not disturb others 3. We bought some cheap battery powered LED lights for the pup but hey if I can just use my trucks battery to light it up all the better. Thank you all for your help with this in advance.