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An apparatus and method are provided for assembling a roof or floor of a cargo body, and for securing doors and other portions of a cargo body in place. In some cases, a plurality of sidewalls are provided, each comprising a side panel and an upper rail and/or lower rail coupled to the side panel. A

An apparatus and method are provided for assembling a roof or floor of a cargo body, and for securing doors and other portions of a cargo body in place. In some cases, a plurality of sidewalls are provided, each comprising a side panel and an upper rail and/or lower rail coupled to the side panel. A roof panel can be located above the plurality of sidewalls adjacent the upper rails, with a roof bow extending between the upper rails below the roof panel and fixed to a track of one of the upper rails with a fastener. A floor cross member can be located between the lower rails, and can be secured to the lower rails via a track and fastener.

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1. A method of assembling a roof of a cargo body, the method comprising: providing a plurality of sidewalls, each comprising a side panel and an upper rail coupled to the side panel;locating a roof panel above the plurality of sidewalls adjacent the upper rails;extending a roof bow between the upper

1. A method of assembling a roof of a cargo body, the method comprising: providing a plurality of sidewalls, each comprising a side panel and an upper rail coupled to the side panel;locating a roof panel above the plurality of sidewalls adjacent the upper rails;extending a roof bow between the upper rails below the roof panel; andfixing the roof bow to a track of one of the upper rails with a fastener. 2. The method of claim 1, wherein the fastener includes a head that is received within and is movable along a slot of the track, wherein the fastener further includes an opposite end located outside of the slot. 3. The method of claim 2, wherein the opposite end is threaded for receiving a nut, wherein the nut is threaded on the fastener to provide a clamping force to secure the fastener with respect to the roof bow. 4. The method of claim 2, wherein the fastener for fixing the roof bow to the track of the upper rail is a T-bolt and further comprising a nut threaded on the T-bolt for providing a clamping force to the roof bow and the track. 5. The method of claim 1, wherein the fastener for fixing the roof bow to the track of the upper rail is a T-bolt. 6. The method of claim 1, wherein the track extends in a lengthwise direction parallel to the roof panel and terminates at a first end and a second end, and wherein the fastener engages with the track at the first end or the second end. 7. The method of claim 1, wherein the fastener is a T-bolt with a rectangular head, wherein: the rectangular head has a width of a first dimension and a length of a second dimension greater than the first dimension; andthe slot of the track has a C-shaped cross-section with a width no less than the first dimension and less than the second dimension. 8. The method of claim 7, wherein fixing the roof bow to a track of one of the upper rails with the T-bolt further includes: aligning the width of the rectangular head of the T-bolt with the width of the slot of the track;translating the T-bolt relative to the track such that the rectangular head is within the track; androtating the T-bolt relative to the track. 9. The method of claim 1, wherein the fastener does not extend through the upper rail. 10. The method of claim 1, further comprising fixing the roof bow to a track of another of the upper rails with another fastener. 11. A cargo body comprising: a floor comprising a floor panel and a cross member for supporting the floor panel;a plurality of sidewalls, each sidewall comprising a side panel and a lower rail coupled to the side panel, wherein each of the plurality of sidewalls extends from the floor at the respective lower rail and at least partially bounds a cargo receiving volume in cooperation with the floor panel;a track extending along the lower rail of a first sidewall of the plurality of sidewalls; anda fastener coupling the cross member to the lower rail of the first sidewall, wherein the fastener is slidably adjustable to different positions along the track to position the cross member to different locations along the lower rail of the first sidewall. 12. The cargo body of claim 11, wherein the fastener is located entirely on one side of the first sidewall. 13. The cargo body of claim 11, wherein the track extends in a lengthwise direction parallel to the floor, and wherein the fastener is slidably adjustable along the track in the lengthwise direction. 14. The cargo body of claim 11, wherein the fastener extends in a first direction from a head of the fastener to a threaded region of the fastener, and wherein the head of the fastener is located within and is trapped within and adjustable along the track to the different positions. 15. The cargo body of claim 14, wherein the fastener is a first fastener, the cargo body further comprising an additional fastener operable to interact with the first fastener to provide a clamping force to the cross member and lower rail. 16. The cargo body of claim 15, wherein the first fastener is a T-bolt and the additional fastener is a nut. 17. The cargo body of claim 11, wherein the fastener is a T-bolt with a head, wherein the head has a width of a first dimension and a length of a second dimension greater than the first dimension, and wherein the track has a C-shaped cross-section with an opening extending along a lengthwise direction with a height greater than or equal to the first dimension and less than the second dimension. 18. The cargo body of claim 11, wherein the track is a first track and the lower rail of the first sidewall is additionally provided with a second track offset from the first track, the cargo body further comprising a second fastener coupling the cross member to the lower rail of the first sidewall, wherein the second fastener is slidably adjustable to different positions along the second track to position the cross member to different locations along the lower rail of the first sidewall. 19. The cargo body of claim 11, further comprising an additional fastener coupling the cross member to a track that extends along the lower rail of a second sidewall of the plurality of sidewalls. 20. A cargo body comprising: a floor;a roof;a plurality of sidewalls extending from the floor to the roof to define a cargo receiving volume in cooperation with the floor and the roof;a track fixed to one or more of the floor, the roof, and a sidewall of the plurality of sidewalls, the track having an elongated slot facing the cargo receiving volume of the cargo body; anda fastener received within the elongated slot and slidably engageable along the track within the elongated slot for adjustably securing a component of the cargo body to different locations along the track.