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A carrier that mounts to a vehicle. In some embodiments, the carrier may include a pair of arms to support a bicycle. Each arm may include one or more securing devices each including a strap to contact a frame region of a bicycle and a pair of buckles to fasten the strap over the frame region. In so

A carrier that mounts to a vehicle. In some embodiments, the carrier may include a pair of arms to support a bicycle. Each arm may include one or more securing devices each including a strap to contact a frame region of a bicycle and a pair of buckles to fasten the strap over the frame region. In some embodiments, the carrier may include a mount for a vehicle hitch. The mount may include a pair of user-actuated coupling members, such as a wedge member and a retractable retainer, each configured to attach the mount to the hitch. One of the coupling members (e.g., the retainer) may serve as a backup for the other coupling member to improve safety. In some embodiments, the carrier may include a mast that is releasable for backward pivotal motion away from the vehicle.

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1. A carrier mountable to a vehicle that includes a hitch having an open end and defining a transverse aperture, comprising: a first portion insertable as a unit into the open end of the hitch and including a retainer and a wedge member that are configured to separately connect the first portion to

1. A carrier mountable to a vehicle that includes a hitch having an open end and defining a transverse aperture, comprising: a first portion insertable as a unit into the open end of the hitch and including a retainer and a wedge member that are configured to separately connect the first portion to the hitch, the retainer having a retracted configuration that permits travel of the first portion into the hitch and an extended configuration in which the retainer is configured to project into the transverse aperture to prevent removal of the inserted first portion from the hitch, wherein the wedge member is configured to engage an inside surface of the hitch to attach the first portion to the hitch; anda second portion configured to remain outside the hitch when the retainer is disposed in the transverse aperture and including a first actuating member manipulable to place the retainer in the retracted configuration and a second actuating member manipulable to adjustably engage the hitch with the wedge member. 2. The carrier of claim 1, wherein a lead screw extends from the first portion to the second portion, and wherein the wedge member is disposed in threaded engagement with the lead screw. 3. The carrier of claim 1, wherein a tube forms part of the first portion and part of the second portion, and wherein the retainer projects from the tube in the extended configuration. 4. The carrier of claim 3, wherein the tube defines a long axis and a guide surface oriented obliquely to the long axis, and wherein the wedge member travels along the guide surface when the second actuating member is turned. 5. The carrier of claim 1, wherein each of the first actuating member and the second actuating member is configured to be engaged by hand when manipulated. 6. The carrier of claim 1, wherein the first actuating member is a button configured to be manipulated by pressing the button. 7. The carrier of claim 1, wherein the second actuating member is configured to be manipulated by turning the second actuating member. 8. The carrier of claim 1, further comprising a deformable biasing member configured to urge the retainer to the extended configuration. 9. A carrier mountable to a vehicle that includes a hitch having an open end and defining a transverse aperture, comprising: a tube including four sides and having an end region insertable into the open end of the hitch;a retainer having a retracted configuration that permits travel of the end region of the tube into the hitch and an extended configuration capable of disposing the retainer at least partially in the transverse aperture of the hitch to prevent removal of the inserted end region of the tube from the hitch, the retainer protruding from only one of the four sides of the tube in the extended configuration; andan actuating member connected to the tube and configured to remain outside the hitch, the actuating member being manipulable to place the retainer in the retracted configuration. 10. The carrier of claim 9, further comprising a wedge member operatively connected to the tube and adjustable to attach the tube to the hitch by engaging the hitch with the wedge member. 11. The carrier of claim 10, further comprising a screw disposed in threaded engagement with the wedge member. 12. The carrier of claim 11, wherein the tube defines a long axis and a guide surface oriented obliquely to the long axis, and wherein the wedge member travels along the guide surface when the screw is turned. 13. The carrier of claim 9, further comprising a deformable biasing member configured to urge the retainer to the extended configuration from the retracted configuration. 14. A carrier mountable to a vehicle that includes a hitch having an open end and defining a transverse aperture, comprising: a first portion insertable as a unit into the open end of the hitch, the first portion including a retainer having a retracted configuration that permits travel of the first portion into the hitch and an extended configuration configured to project into the transverse aperture of the hitch to prevent removal of the inserted first portion from the hitch;a second portion configured to remain outside the hitch and including an actuating member configured to be pressed manually to place the retainer in the retracted configuration from the extended configuration; anda deformable biasing member configured to return the retainer to the extended configuration when the actuating member is no longer being pressed. 15. The carrier of claim 14, wherein the deformable biasing member includes a spring. 16. The carrier of claim 14, wherein a tube forms part of the first portion and part of the second portion, and wherein the retainer projects from the tube in the extended configuration. 17. The carrier of claim 16, further comprising a wedge member connected to the tube, wherein the retainer and the wedge member are adjustable separately from one another.