[Don Joe]

"It's the 'Keep On Truckin'' guy!"

You're thinking of Mr. Natural. I don't think R. Crumb ever had him doing the Truckin' Step, but I may be mistaken on that. I haven't read his "work" for a bit over 30 years...

[stilts]

R. Crumb had just about everyone doing the "Truckin' Step". From the Fabulous Furry Freak Brothers to Mr. Natural. Mr. Natural was, however, well known for just that pose.