These are vehicles generated for Fisher-Price Brands and Jim Henson Studios for the feature film; The Adventures of Elmo in Grouchland
At the time, FP Brands held the Sesame Street / Muppets license. While in pre-production Henson Studios called on product development at Fisher-Price to come up with concepts for background vehicles for the film.
The parameters for this assignment were pretty straightforward; Come up with a handful of vehicles comprised entirely of junk. The resulting concept sketches were a series of drivable ready-mades that could pass as cars, trucks, and vans for incidental use in populating the world of Junk.