Found 1987 Chevrolet Light Duty Truck Service Manual, Unit Repair Manual, & Fuel, Drivability and Emissions Manual on CD (e-bay) for $25 with free shipping. Just got it today and looks like a great deal. If anyone needs anything from them, let me know.
I've also scanned the R/V truck sections of the '87 GMC wiring manual. I'm going to re-scan all the pages and save them as a PDF.