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A rack system that is configured to allow the omission of cross bars. The cross bars can be easily removable and replaceable or can be adjustable along a length of the rack system. In some configurations, the rack system includes at least one side support arrangement comprising a first vertical supp

A rack system that is configured to allow the omission of cross bars. The cross bars can be easily removable and replaceable or can be adjustable along a length of the rack system. In some configurations, the rack system includes at least one side support arrangement comprising a first vertical support and a second vertical support. Two or more side support arrangements can be provided on each side of the truck bed. Pairs of support arrangements on one side of the truck bed can be connected by one or more longitudinal supports. Accessories, such as tool boxes or gas cans, can be connected to the one or more longitudinal supports.

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1. A toolbox for a truck bed rack, the truck bed rack having an upper longitudinal rail and a lower longitudinal rail each extending in a lengthwise direction relative to an associated truck bed, the upper and lower longitudinal rails positioned above a sidewall of the associated truck bed, the tool

1. A toolbox for a truck bed rack, the truck bed rack having an upper longitudinal rail and a lower longitudinal rail each extending in a lengthwise direction relative to an associated truck bed, the upper and lower longitudinal rails positioned above a sidewall of the associated truck bed, the toolbox comprising: a toolbox body having an upper wall, a lower wall and a pair of spaced-apart side walls extending between the upper wall and the lower wall, the upper wall, the lower wall and the pair of side walls cooperating to define a storage space;an upper mounting bracket configured to support the toolbox in a cantilevered manner from the upper longitudinal rail, the upper mounting bracket comprising a first upper bracket portion extending upwardly from the upper wall at a location adjacent to a laterally outer end of the toolbox with respect to a truck bed centerline and configured to be coupled to the upper longitudinal rail;a lower mounting bracket configured to support the toolbox in a cantilevered manner from the lower longitudinal rail, the lower mounting bracket comprising a first lower bracket portion extending downwardly from the lower wall at a location adjacent to the laterally outer end of the toolbox and configured to be coupled to the lower longitudinal rail;wherein the upper mounting bracket and the lower mounting bracket form the only support for the toolbox relative to the truck bed rack or the associated truck bed. 2. The toolbox of claim 1, wherein the upper mounting bracket further comprises a second upper bracket portion that has a greater length than the first upper bracket portion, wherein the second upper bracket portion extends along and is attached to the upper wall of the toolbox. 3. The toolbox of claim 2, wherein the lower mounting bracket further comprises a second lower bracket portion that has a greater length than the first lower bracket portion, wherein the second lower bracket portion extends along and is attached to the lower wall of the toolbox. 4. The toolbox of claim 3, wherein the second upper bracket portion and the second lower bracket portion are parallel to one another. 5. The toolbox of claim 3, wherein the toolbox defines a height in a direction between the upper wall and the lower wall and a depth in a direction aligned with the upper wall and the lower wall, wherein the second upper bracket portion and the second lower bracket portion are offset from one another along the depth of the toolbox. 6. The toolbox of claim 5, wherein the laterally outer end of the toolbox is oblique with respect to the upper wall and the lower wall. 7. The toolbox of claim 1, wherein the first upper bracket portion is formed integrally with the upper wall and the first lower bracket portion is formed integrally with the lower wall. 8. The toolbox of claim 1, wherein the laterally outer end of the toolbox includes an opening to the storage space. 9. The toolbox of claim 1, wherein the first upper bracket is configured to be aligned with a laterally outward side of the upper longitudinal rail with respect to the truck bed centerline and the first lower bracket is configured to be aligned with a laterally outward side of the lower longitudinal rail with respect to the truck bed centerline. 10. A rack system for use in a truck bed, comprising: a pair of first side supports located, in use, on opposing sides of the truck bed;a pair of second side supports located, in use, on opposing sides of the truck bed at locations spaced away from the pair of first side supports along a length of the truck bed;an upper longitudinal rail and a lower longitudinal rail positioned on one of the opposing sides of the truck bed and extending between the first side support and the second side support on the one side;a toolbox comprising: a toolbox body having an upper wall, a lower wall and a pair of spaced-apart side walls extending between the upper wall and the lower wall, the upper wall, the lower wall and the pair of side walls cooperating to define a storage space;an upper mounting bracket configured to support the toolbox from the upper longitudinal rail, the upper mounting bracket extending upwardly from the upper wall at a location adjacent to a laterally outer end of the toolbox with respect to a longitudinal centerline of the truck bed and configured to be coupled to the upper longitudinal rail by at least one fastener;a lower mounting bracket configured to support the toolbox from the lower longitudinal rail, the lower mounting bracket extending downwardly from the lower wall at a location adjacent to the laterally outer end of the toolbox and configured to be coupled to the lower longitudinal rail by at least one fastener;wherein the toolbox defines a height in a direction between the upper wall and the lower wall and a depth in a direction extending towards the longitudinal centerline with the lower wall, wherein the upper mounting bracket and the lower mounting bracket are offset from one another along the depth of the toolbox;wherein the storage space is spaced laterally inwardly towards the longitudinal centerline of the truck bed from the upper and lower mounting brackets and the upper mounting bracket and the lower mounting bracket form the only support for the toolbox relative to the truck bed rack or the truck bed;wherein the toolbox is configured to be positioned above a sidewall of the truck bed. 11. The system of claim 10 further comprising: a first cross bar extending between the opposing sides of the truck bed, the first cross bar being removable from or adjustable along a length of the upper rail, and a second cross bar extending between the pair of second side supports;wherein each of the first side supports comprises a first post and a second post, the first post supported by the truck bed at a first location and the second post supported by the truck bed at a second location spaced from the first location such that each of the first side supports is self-supporting. 12. The toolbox of claim 10, wherein the upper mounting bracket comprises a first upper bracket portion and a second upper bracket portion, the second upper bracket portion having a greater length than the first upper bracket portion, and the second upper bracket portion extends along and is attached to the upper wall of the toolbox. 13. The toolbox of claim 12, wherein the lower mounting bracket comprises a first lower bracket portion and a second lower bracket portion, the second lower bracket portion having a greater length than the first lower bracket portion, and the second lower bracket portion extends along and is attached to the lower wall of the toolbox; and wherein the second upper bracket portion and the second lower bracket portion are parallel to one another. 14. The toolbox of claim 13, wherein the first upper bracket portion is aligned with a laterally outward side of the upper longitudinal rail with respect to the longitudinal centerline and the first lower bracket is aligned with a laterally outward side of the lower longitudinal rail with respect to the longitudinal centerline. 15. The toolbox of claim 10, wherein the laterally outer end of the toolbox is oblique with respect to the upper wall and the lower wall. 16. The toolbox of claim 15, wherein the laterally outer end of the toolbox includes an opening to the storage space. 17. The toolbox of claim 10, wherein the upper mounting bracket is formed integrally with the upper wall and the lower mounting bracket is formed integrally with the lower wall. 18. A toolbox for a truck bed rack, the truck bed rack having an upper longitudinal rail and a lower longitudinal rail each extending in a lengthwise direction relative to a truck bed, the toolbox comprising: a toolbox body having an upper wall, a lower wall and a pair of spaced-apart side walls extending between the upper wall and the lower wall, the upper wall, the lower wall and the pair of side walls cooperating to define a storage space;an upper mounting bracket configured to support the toolbox from the upper longitudinal rail, the upper mounting bracket extending upwardly from the upper wall at a location adjacent to a laterally outer end of the toolbox with respect to a longitudinal centerline of the truck bed and configured to be coupled to the upper longitudinal rail by at least one fastener;a lower mounting bracket configured to support the toolbox from the lower longitudinal rail, the lower mounting bracket extending downwardly from the lower wall at a location adjacent to the laterally outer end of the toolbox and configured to be coupled to the lower longitudinal rail by at least one fastener;wherein the toolbox defines a height in a direction between the upper wall and the lower wall and a depth in a direction extending towards the longitudinal centerline with the lower wall, wherein the upper mounting bracket and the lower mounting bracket are offset from one another along the depth of the toolbox;wherein the storage space is configured to be spaced laterally inwardly towards the a longitudinal centerline of the truck bed from the upper and lower mounting brackets in use, and the upper mounting bracket and the lower mounting bracket form the only support for the toolbox relative to the truck bed rack or the truck bed;wherein the toolbox is configured to be positioned above a sidewall of the truck bed. 19. The toolbox of claim 18, wherein the lower mounting bracket comprises a first lower bracket portion and a second lower bracket portion, the second lower bracket portion having a greater length than the first lower bracket portion, and the second lower bracket portion extends along and is attached to the lower wall of the toolbox; and wherein the second upper bracket portion and the second lower bracket portion are parallel to one another. 20. The toolbox of claim 19, wherein the first upper bracket portion is aligned with a laterally outward side of the upper longitudinal rail with respect to the longitudinal centerline and the first lower bracket is aligned with a laterally outward side of the lower longitudinal rail with respect to the longitudinal centerline. 21. The toolbox of claim 18, wherein the laterally outer end of the toolbox is oblique with respect to the upper wall and the lower wall. 22. The toolbox of claim 21, wherein the laterally outer end of the toolbox includes an opening to the storage space. 23. The toolbox of claim 18, wherein the upper mounting bracket is formed integrally with the upper wall and the lower mounting bracket is formed integrally with the lower wall.