Cool idea. What exactly would you be powering inside an Explorer?
8 blind nuts for the roof rails (4 each side) sounds about right on my Explorer. All but the one came out without a problem. I've since tried removing a couple other racks on these vehicles at the JY and there were always at least a couple screws that gave me trouble. Usually, it resulted in stripping out the slots in the phillips head screws before the blind nut let go. I'm no novice when it comes to removing stubborn bolts/nuts/screws living here in the Rust Belt...but, despite my careful efforts and use of PB Blaster as I slowly backed it in and out, it still fought me and the nut let go inside the panel. I pulled down the rear corner of the headliner to see if I couldn't get access to it and there was only a hole in the inner panel large enough to reach as far back as I could with the tip of my finger to feel it turning. No way to get a wrench on it to hold it while trying to finish extracting it...let alone to get a replacement nut on an installation. As I said, I could have probably cut a larger opening if I really wanted to...but, I wasn't that motivated and just left things as they were and put some RTV around the screw head to prevent leaks. Hardly ever use the rack, anyway. Good luck if you do decide to proceed.