Scuttle Bus

I could use any info anyone is willing to give me on my particular shuttle bus. It's a 98 ford e350 powerstroke V8 Diesel and has 8 windows on the drivers side. This is my dream finally coming to fruition! I have done a lot of great down and rust repairs already and am going to lighten it a great bit! Lighter woods and metals. I have no clue what the gvwr is ? How much weight i can add to it? I mean i will take any info anyone can provide me on this SPECIFIC model and yr. Its hard to find anything on it. I probably just don't know how to work the internet lol. I would also love to know if i would be able to get a book on it or some sort of owners manual like u can get at the auto parts store but from the manufacturer. Anyways. I hope to hear from yall. I hear this is the place to get answers lol. Thank u guys for entertaining my questions and thanks preemptively for the answers! Have a great day YALL!!!