I wrote a couple Wacky Races stories during my tenure writing the DC/Cartoon Network/Hanna-Barbera titles. One has all the characters in a story I'll post sometime in the future. If I had wrote more stories, I might have proposed solo stories of the Wacky Races characters. The series was a showcase for series in development at the time. One of the things that did make it to its own show was Dastardly and Muttley In Their Flying Machines (which some erroneously call Stop The Pigeon) which I wrote a story for.
This is from Cartoon Network Presents #7 in February 1998
An anecdote I forgot to mention on previous posts was that a potential writer was asked to do a Scooby-Doo script, but had never seen the series and was told to watch one to get a gist of the characters. She wrote a story with David Cassidy thinking he was one of the recurring characters in the cartoon. When you're six, you don't know the celebrities that made appearances are actual people, but it's weird when you're an adult.