Rotatable aerodynamic fairing system

1. A fairing assembly adapted to couple to a vehicle, the fairing assembly comprising:

a support arm adapted to mount to a frame rail, the support arm having a long axis;

a fairing adapter adapted to mount a fairing to the support arm, the fairing adapter rotatably coupled to the support arm and rotatable about an axis of rotation that is angled from the long axis of the support arm, the fairing adapter rotatable about the axis of rotation from a first orientation corresponding to an aerodynamic position to a second orientation corresponding to a first access position in which the fairing is at least partially behind the support arm or in which the fairing is at least partially in front of the support arm; and

a releasable lock to lock the fairing adapter in the first orientation and releasable to allow the fairing adapter to rotate to the second orientation.

2. The fairing assembly of claim 1 , further comprising the fairing, the fairing mounted to the fairing adapter and positionable in the aerodynamic position and the first access position.

3. The fairing assembly of claim 2 , wherein the fairing is at least partially behind the support arm when in the first access position.

4. The fairing assembly of claim 2 , wherein the fairing adapter is rotatable about the axis of rotation to a third orientation to rotate the fairing to a second access position in which the fairing is at least partially behind the support arm.

5. The fairing assembly of claim 1 , wherein the fairing adapter comprises a vertical end plate.

6. The fairing assembly of claim 5 , wherein the fairing adapter comprises a joint bracket mountable to the vertical end plate in a plurality of positions.

7. The fairing assembly of claim 1 , wherein the fairing adapter is dismountable from the support arm in the second orientation.

8. The fairing assembly of claim 1 , wherein the axis of rotation is a horizontal axis.

9. The fairing assembly of claim 1 , wherein the axis of rotation is a vertical axis.

10. A fairing assembly adapted to couple to a vehicle, the fairing assembly comprising:

a support arm adapted to mount to a frame rail;

a set of side plates coupled to the support arm;

a fairing adapter adapted to mount a fairing to the support arm, the fairing adapter comprising:

an end plate; and

a set of adapter sidewalls extending inboard relative to the end plate, the set of adapter sidewalls overlapping the set of side plates;

a first member extending between the set of adapter sidewalls and defining an axis of rotation, the fairing adapter rotatable about the axis of rotation from a first orientation corresponding to an aerodynamic position to a second orientation corresponding to a first access position; and

a releasable lock to lock the fairing adapter in the first orientation and releasable to allow the fairing adapter to rotate to the second orientation.

11. The fairing assembly of claim 10 , further comprising the fairing, the fairing mounted to the fairing adapter and positionable in the aerodynamic position and the first access position.

12. The fairing assembly of claim 10 , further comprising a crossbar extending between the set of adapter sidewalls and spaced from the first member, wherein the set of side plates comprises slots to receive the crossbar when the fairing adapter is in the first orientation and wherein the releasable lock is adapted to capture the crossbar in the slots and releasable to allow the crossbar to exit the slots.

13. The fairing assembly of claim 12 , further comprising a bracket portion coupled to the support arm, the bracket portion comprising a vertical plate and the set of side plates, the set of side plates extending outboard from the vertical plate.

14. The fairing assembly of claim 10 , further comprising a second member that extends between the set of adapter sidewalls, wherein the set of side plates defines a set of guide paths through which the second member extends, wherein the second member acts as a follower to follow the set of guide paths as the fairing adapter rotates from the first orientation to the second orientation.

15. The fairing assembly of claim 10 , wherein the support arm has a long axis and wherein the axis of rotation is angled from the long axis.

16. The fairing assembly of claim 10 , wherein the axis of rotation is a horizontal axis.

17. A fairing assembly adapted to couple to a vehicle, the fairing assembly comprising:

a support arm adapted to mount to a frame rail;

a fairing adapter adapted to mount a fairing to the support arm, the fairing adapter rotatably coupled to the support arm and rotatable about a vertical axis of rotation from a first orientation corresponding to an aerodynamic position to a second orientation corresponding to a first access position in which the fairing is at least partially behind the support arm or in which the fairing is at least partially in front of the support arm; and

a releasable lock to lock the fairing adapter in the first orientation and releasable to allow the fairing adapter to rotate to the second orientation.

18. The fairing assembly of claim 17 , further comprising the fairing, the fairing mounted to the fairing adapter and positionable in the aerodynamic position and the first access position.

19. The fairing assembly of claim 18 , wherein the fairing is at least partially behind the support arm when in the first access position.

20. The fairing assembly of claim 17 , wherein the fairing adapter is rotatable about the vertical axis of rotation to a third orientation to rotate the fairing to a second access position in which the fairing is at least partially behind the support arm.