On market for a peter

I found one of walmart's old 2016 Peterbilt 579 isx cummins 400 hp, 2.47 ratio with 560K miles on it. I've always driven a freightliner for my company doing local work in CA and never had a problem with the DD15. But it's difficult to find a well priced Manual transmission freightliner nowadays. I can afford this pete because of the high mileage on it. By what I've heard from Walmart drivers is that the trucks are maintained in top shape. If I do get the truck I plan on keeping up on the maintenance too and also change parts that i know that go bad at certain mileage way ahead of time, thats when I get the money of course. But things happen, thats why I would like to know what are your thoughts on the truck specs, engine in particular and any other recommendations. I would appreciate it.