These are RACO cars that were modified by Steve Skellenger and Robert Bates of SEco santa ana years ago. This was one of many projects that they worked on to increase the possible applications for their Skellenger rear ends to help increase sales. There were 3 of these cars built by skellenger engineering and they currently reside in the QSL museum
Basically the construction is the same as the Raco version with the major exception of the rear end. The whole back section was custom built to house the skellenger rear end. Basic ground effects were constructed and there were small details done to the front end of the car as well. These were never sold to the public and they were used as company cars.