Adjustable cab extender

1. A cab extender assembly for selectively changing the aerodynamic drag on a vehicle having a longitudinal axis, comprising:

a fixed cab extender having a first side surface forming an exterior surface of the vehicle and a second side surface opposite said first side surface;

at least one track disposed on said second side surface and extending generally parallel to the longitudinal axis;

an adjustable cab extender disposed on said second side surface of said fixed cab extender and having at least one moveable member engaged in said track;

an actuator assembly configured for selectively reciprocating said adjustable cab extender along said track and along said second side surface of said fixed cab extender.

2. The cab extender assembly of claim 1 wherein said adjustable cab extender is moveable between a stowed position and a deployed position.

3. The cab extender assembly of claim 2 wherein said adjustable cab extender is positionable generally parallel to and adjacent an inside surface of said fixed cab extender in the stowed position.

4. The cab extender assembly of claim 1 wherein said actuator assembly deploys said adjustable cab extender above a predetermined speed.

5. The cab extender assembly of claim 1 wherein said at least one track includes a main member and two side members forming a channel.

6. The cab extender of claim 5 wherein said at least one track is integrally formed.

7. The cab extender assembly of claim 1 wherein said at least one moveable members further comprise at least one wheel.

8. The cab extender assembly of claim 1 wherein said adjustable cab extender is formed of a flexible material.

9. The cab extender assembly of claim 1 wherein said actuator assembly comprises a extender actuator and at least one linkage coupled between said extender actuator and said adjustable cab extender.

10. An adjustable cab extender kit for retrofitting an existing, fixed cab extender having a first side surface forming an exterior surface of a vehicle and a second side surface opposite said first side surface, the kit configured for selectively changing the aerodynamic drag on the vehicle having a longitudinal axis, comprising:

at least one track configured to be disposed on the second side surface of the fixed cab extender and extending generally parallel to the longitudinal axis of the vehicle;

an adjustable cab extender;

at least one moveable member configured to be coupled to said adjustable cab extender and configured to be received in said track;

an actuator assembly configured for selectively reciprocating said adjustable cab extender along said track and along said second side surface of said fixed cab extender.

11. The adjustable cab extender kit of claim 10 wherein said adjustable cab extender is flexible.

12. The adjustable cab extender kit of claim 10 wherein said at least one track is configured to be mountable on the fixed cab extender.

13. The adjustable cab extender kit of claim 10 wherein said actuator assembly deploys said adjustable cab extender above a predetermined speed.

14. A method for retrofitting a vehicle having an existing, fixed cab extender having a first side surface forming an exterior surface of a vehicle and a second side surface opposite said first side surface, the method for selectively changing the aerodynamic drag on the vehicle having a longitudinal axis, comprising:

mounting at least one track on the second side surface of the fixed cab extender and extending generally parallel to the longitudinal axis of the vehicle;

providing an adjustable cab extender;

coupling at least one moveable member to said adjustable cab extender and to said at least one track, wherein said moveable member is received by said track;

providing an actuator assembly configured for selectively reciprocating said adjustable cab extender along said track and along said second side surface of said fixed cab extender.