MIL wants to sell FIL's 2004 Sierra 1500 4x4, mainly because he's got some health issues and isn't driving anymore. It spends time in their garage with the battery running down, though they did have the mouse-eaten fusebox replaced which took care of the electrical problems. I drove it for a week last fall, it's a nice truck. Any words of wisdom helping them sell it? Figured I'll try Craigslist or FB Marketplace.