Abstract: The present mechanic's creeper is particularly well suited for use by professional drivers and others who have need to perform occasional maintenance and other work beneath a vehicle while on the road. The present creeper includes a retractable extension, which enables the device to be collapsed from its fully extended working configuration to a more compact size for storage within a storage case for carriage within a small storage area in a truck or other motor vehicle. The configuration of the retractable extension still provides an enclosed storage area for tools and equipment between the frame rails of the creeper, even when the extension is retracted. The device also includes removable arm rests with tool pouches for convenience while working, as well as articulated work lights which may be aimed to suit the user and a warning light which may be attached to the device.