I was spinning my wheels about your setup for a bit, but couldn't come up with anything since I don't know how you lost your perimeter lighting either. Was gonna say tap into the reverse light signal, run it through a NC relay or mosfet, that is tied to the ignition, so when you turn the key that circuit opens. But if they don't fire when you unlock the truck, that won't work.
As for me, changed the oil and filter this morning, and installed a Fumoto quick valve. So sometime next year, I'll see just how long it takes to drain the pan with the smaller passageway. Can't close that access door, and can't seem to get it off completely either. That's annoying.
Anyone know how to get that thing off?