What Ipad model for an Electrical Engineer on a Cruise Ship

Hi, I would like to ask you, which iPad model would best suit my requirements. So in short what do I need. I work on passenger ships as an electrical engineer, I need a fairly large device to conveniently read electrical diagrams or machine manuals, without having to run across many decks to the computer and print, etc. The problem is that the PDFs are 600mb and I don't know if the iPad will handle it and open them smoothly as well as cad files? In addition, I like watching movies and series and playing games. I have 130Mbps Internet on the ship and ping at 28ms. As I understand, cloud gaming should work without any problems? I was thinking about the Ipad pro M4, to be sure that the documents will load quickly