Chris what I found if you set up an online account using the generic "my.gm.com" it defaults to whatever brand you register. I've got all 3 of my GM vehicles with an account. They all show up in the header and whichever one I'm logged into will show my.cadillac or Chevrolet or gmc. com
But there's some good info on the site. I downloaded the various available manuals for my vehicles. I say available..... there wasn't one for the 95 S-10 but I have the paper version.