No this isn't a post about the Joby on wheels that could run you several hundred dollars. This video from Peter Wiren is a very simple method creating less friction to the Joby GorillaPod ends and sliding it on some basic rails. The rails are made from brackets normally used for hanging closet shelves, held together with basic joining plates, all found at any local hardware store. [Thanks Peter]
You'll need that sturdy large SLR flexible tripod base from Joby found below.
Joby GorillaPod SLR Flexible Tripod