Not sure if it's well-hidden on Youtube, was taken down, or if I just suck at searching.
There were a couple clips of what I'm told was a late 80's Great American Bash. Ron Garvin had taken a camcorder backstage and got some great candid footage of the Road Warriors, Dusty, Sting, Cornette, etc.
I have no idea why Trojan became the market leader. It's like the Pinto of jimmy hats. Thankfully Eddie won the World Title and Vince Russo wasn't rehired or we'd have Eddie vs. Chavo at Mania in a Trojan on a Pole Match.