The only Power Wagon specific items that I would check above and beyond a normal truck:
- make sure the winch controller is actually there, and plug it in and a quick check will show the winch works in both directions. Visual check of the cable will quickly show any obvious issues......wouldn't be surprised if the winch had never actually been used
- verify the lockers and swaybar actually work.....keep in mind they can be a little finnicky and take a while to engage especially if they have never, or rarely, been used.......just like the winch, wouldn't be surprised if they had never been used
- maybe pay a little closer attention under the truck and look for evidence of off-road bashing (dents, scrapes, bends, etc....).....again, good chance it was never used much off-road but there are some that have been beaten on........just keep in mind that dealerships often repaint/recoat the bottoms of vehicles
Can't count the number of people I have dealt with over the years that have 4wd vehicles and have never used 4wd, and don't know how to shift it into 4wd. Guy at work bought a Wrangler Rubicon last year and when I asked about the lockers and swaybar disconnect he looked at me with blank eyes and had zero clue what I was talking about. Our off-road club hosts several "novice trail rides" every year and it's almost guaranteed that somebody will get stuck on the first obstacle of the day and you find out they are in 2wd, and half the time we have to go show them how to shift into 4wd. Last example is a friend's wife you has driven the same 4wd SUV for at least 7-8 years. Last winter she got "stuck" (more like slightly hung up) in a snowy parking lot and had to get the owner's manual out to figure out how to pull the shift lever from 2wd to 4hi.