Yep, nice work. I was lucky enough to pick up three fresh from the dealer over the years. One GMC "fishbowl" and two Kenworths. Don't remember them being that clean though..
Fifth wheel is always covered in grease. If there was never a trailer on it, it has a bead of grease squiggled over the face. Easily replicated by some artist oil tube paint, just put some in a hypo and squirt in a squiggle over the fifth wheel.