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A coupling device for coupling a rack component, such as a crossbar, to a vehicle rack, and apparatus that include the coupling device. The coupling device includes a first portion for attachment to the rack component and a second portion for coupling to the vehicle rack. A fastener member moves alo

A coupling device for coupling a rack component, such as a crossbar, to a vehicle rack, and apparatus that include the coupling device. The coupling device includes a first portion for attachment to the rack component and a second portion for coupling to the vehicle rack. A fastener member moves along an axis to couple the second portion to the vehicle rack. The coupling device also includes a security mechanism. The security mechanism may be implemented volitionally and/or irreversibly. The security mechanism prohibits movement of the fastener member that would uncouple the second portion from the vehicle rack but allows limited movement of the fastener member along the axis. The limited movement adjusts the second portion between fixed and movable conditions on the vehicle rack, allowing the rack component to be re-positioned on the vehicle rack but not removed.

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1. A coupling device for attaching a crossbar to a rail of a vehicle rack, comprising:a first portion configured for connection to the crossbar;a second portion configured for connection to the rail, the second portion fitting together with the first portion to define a passage along an axis;a faste

1. A coupling device for attaching a crossbar to a rail of a vehicle rack, comprising:a first portion configured for connection to the crossbar;a second portion configured for connection to the rail, the second portion fitting together with the first portion to define a passage along an axis;a fastener member that is received in the passage to join the first portion to the second portion and to couple the second portion to the rail; anda security mechanism configured to prohibit complete disengagement of the fastener member from the passage but to allow limited movement of the fastener member along the axis, the limited movement adjusting the second portion between fixed and movable positions on the rail, thereby allowing the crossbar to be re-positioned but not removed from the rail;wherein the fastener member defines an annular recess, the security mechanism including a retaining member, wherein the security mechanism is implemented by disposing the retaining member at least partially in the annular recess, and further wherein the passage is a first passage, and at least one of the first and second portions defines a second passage that joins the first passage, the second passage being configured to receive the retaining member or implementation of the security mechanism. 2. The coupling device of claim 1, wherein the first and second portions are formed together as a unit. 3. The coupling device of claim 1, wherein the first and second portions are separate pieces. 4. The coupling device of claim 1, wherein the security mechanism is configured to be implemented volitionally in a separate step from inserting the fastener member in the first passage. 5. The coupling device of claim 1, wherein the security mechanism is configured to be implemented irreversibly. 6. The coupling device of claim 1, wherein the fastener member is threaded, and the fastener member moves along the axis and engages at least part of the first passage by rotation. 7. The coupling device of claim 1, wherein the second portion is configured to substantially encompass the rail. 8. The coupling device of claim 1, wherein the second portion includes opposing sides, and the opposing sides grip the rail in the fixed positions. 9. The coupling device of claim 1, wherein the fastener member includes a shaft having a narrowed neck region, and the retaining member is disposed adjacent the narrowed neck region of the fastener member to prohibit the disengagement of the fastener member from the first passage. 10. The coupling device of claim 1, wherein the first passage is substantially perpendicular to the second passage. 11. A coupling device for attaching a rack component to a vehicle rack, comprising:a first portion for attachment to the rack component;a second portion that joins to the first portion;a fastener member that couples the second portion to the vehicle rack, the fastener member coupling and uncoupling by moving along an axis; anda security mechanism configured to prohibit complete removal of the fastener member from the second portion but to allow limited movement of the fastener member along the axis, the limited movement adjusting the second portion between fixed and movable positions on the vehicle rack, thereby allowing the rack component to be re-positioned but not removed from the vehicle rack, wherein the security mechanism includes a retaining member, a least one of the first and second portions including a passage that receives the retaining member from exterior the device to prohibit the uncoupling. 12. The coupling device of claim 11, wherein the security mechanism is configured to be implemented volitionally, implementation being separate from the coupling by the fastener member. 13. The coupling device of claim 11, wherein the security mechanism is configured to be implemented irreversibly. 14. The coupling device of claim 11, wherein the fastener member includes nonoverlapping first and second regions, the first region engaging the se cond portion, and the second region of the fastener member forming part of the security mechanism. 15. The coupling device of claim 11, wherein the fastener member has an elongate body with a narrowed neck region, the narrowed neck region forming part of the security mechanism. 16. The coupling device of claim 11, wherein the fastener member includes a head and a shank, the shank including a threaded region that engages the second portion to provide the coupling and a retaining portion that forms part of the security mechanism, the retaining portion being disposed intermediate the threaded region and the head. 17. The coupling device of claim 11, wherein the first and second portions are formed separate and configured to fit together, the fastener mechanism joining the first and second portions as it couples the second portion to the vehicle rack. 18. The coupling device of claim 11, wherein the first and second portions fit together to form a passage, the axis extending through the passage. 19. The coupling device of claim 11, wherein the fastener member is a bolt. 20. The coupling device of claim 11, wherein the second portion is configured to substantially encompass and grip a region of the vehicle rack. 21. The coupling device of claim 11, the rack component being a crossbar, and the second portion coupling the crossbar to a side rail of the vehicle rack. 22. The coupling device of claim 11, wherein the fastener member has a body with a narrowed neck, and the retaining member contacting the narrowed neck to prohibit complete removal of the fastener member from the second portion. 23. A coupling device for attaching a crossbar to a rail of a vehicle rack, comprising:a first portion configure for attachment to the crossbar;a second portion configured for attachment to the rail, the second portion fitting together with the first portion to define a passage;a fastener member that is received in the passage to join the first portion to the second portion and to couple the second portion to the rail, wherein the fastener member includes a shank having a narrowed neck region, and further wherein the fastener member adjusts how tightly at least two non-parallel sides of the second portion grips the rail; anda retaining member configured to be positioned adjacent the narrowed neck region of the fastener member, thereby prohibiting complete disengagement of the fastener member from the passage, but allowing limited movement of the fastener member within the passage, so that the crossbar can be re-positioned but not removed from the rail. 24. The coupling device of claim 23, wherein the shank includes threads and the fastener member moves along the passage by rotation. 25. The coupling device of claim 23, wherein the retaining member is configured to be positioned adjacent the narrowed neck region irreversibly. 26. The coupling device of claim 23, wherein the second portion includes a clamp configured to extend substantially around the rail, and the fastener member adjusts how tightly the lamp grips the rail. 27. A coupling device for attaching a crossbar to a rail of a vehicle rack, comprising:a first portion for attachment to the crossbar, the first portion having a first surface;a second portion including opposing sides configured to flank the rail above and below and having a second surface, the second portion fitting together with the first portion to appose the first and second surfaces and to define a passage; anda fastener member received in the passage, the fastener member being movable through the passage along a first axis to join the first portion to the second portion and to couple the second portion to the rail,wherein the fastener member and the first and second surfaces are oriented to produce sliding motion of the first surface along the second surface in response to movement of the fastener member along the first axis, the sliding motion urging the second portion toward the first portion generally along a second axi s that is orthogonal both to the first axis and to a long axis of the rail. 28. The coupling device of claim 27, each of the first and second surfaces including plural surfaces, and the plural surfaces of the second portion being configured to slide along the plural surfaces of the first portion. 29. The coupling device of claim 27, wherein the plural surfaces of the first and second portions are configured to converge toward the crossbar. 30. The coupling device of claim 27, wherein the second portion includes a connecting region that joins the opposing sides, the first portion including a side wall that opposes the connecting region of the second portion when the first and second portions are fitted together, and the side wall and connecting region being urged together in response to sliding motion. 31. The coupling device of claim 27, wherein the first and second surfaces are configured to be oriented obliquely to the first and second axes. 32. The coupling device of claim 27, wherein the fastener member is threaded, and the fastener member moves along the first axis and engages at least part of the passage by rotation. 33. The coupling device of claim 27, wherein the second portion is configured to substantially encompass the rail. 34. The coupling device of claim 27, wherein the second portion includes opposing sides, and the opposing sides grip the rail. 35. The coupling device of claim 27, further comprising:a security mechanism configured to prohibit complete disengagement of the fastener member from the passage but to allow limited movement of the fastener member along the first axis, the limited movement adjusting the second portion between fixed and movable positions on the rail, thereby allowing the crossbar to be re-positioned but not removed from the rail. 36. The coupling device of claim 35, wherein the security mechanism is configured to be implemented volitionally in a separate step from inserting the fastener member in the passage. 37. The coupling device of claim 35, wherein the security mechanism is configured to be implemented irreversibly. 38. The coupling device of claim 35, wherein the fastener member includes a shaft having a narrowed neck region, the security mechanism including a retaining member that is disposed adjacent the narrowed neck region of the fastener member to prohibit the disengagement of the fastener member from the passage. 39. The coupling device of claim 35, wherein the fastener member defines an annular recess, the security mechanism including a retaining member, and wherein the security mechanism is implemented by disposing the retaining member at least partially in the annular recess. 40. The coupling device of claim 35, wherein the passage is a first passage, and at least one of the first and second portions defines a second passage that joins the first passage, the second passage being configured to receive the retaining member for implementation of the security mechanism. 41. The coupling device of claim 40, wherein the first passage is substantially perpendicular to the second passage. 42. An apparatus for carrying cargo on a vehicle having a pair of rails, comprising:a crossbar having an end portion;a clamp portion, the clamp portion being configured for connection to one of the rails, the clamp portion fitting together with the end portion to define a passage along an axis;a fastener member that is received in the passage to join the end portion to the clamp portion and to couple the clamp portion to the one rail, wherein the fastener member adjusts how tightly at least two non-parallel sides of the clamp portion grips the one rail; anda security mechanism configured to prohibit complete disengagement of the fastener member from the passage but to allow limited movement of the fastener member along the axis, the limited movement adjusting the clamp portion between fixed and movable positions on the one rail, thereby allowing the crossbar to be re-positioned but not removed f rom the one rail. 43. The apparatus of claim 42, the crossbar having a middle portion disposed adjacent the end portion, and the middle portion being formed separately from the end portion. 44. The apparatus of claim 42, the crossbar having a middle portion disposed adjacent the end portion, and the middle portion being formed unitarily with the end portion. 45. The apparatus of claim 42, the end portion being a first end portion, the crossbar having a second end portion that opposes the first end portion, the clamp portion being a first clamp portion, and the apparatus further comprising a second clamp portion that is substantially similar to the first clamp portion.