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A vehicle side fairing having a first fairing panel fixedly secured to the underside of a trailer box, and a second fairing panel slidable mounted to plural cylindrical bars mounted on the underside of the trailer box in a fore and aft orientation. The second fairing panel is secured to the wheel se

A vehicle side fairing having a first fairing panel fixedly secured to the underside of a trailer box, and a second fairing panel slidable mounted to plural cylindrical bars mounted on the underside of the trailer box in a fore and aft orientation. The second fairing panel is secured to the wheel set with a mechanical fastener that selectively joins and releases the second fairing panel and the wheel set.

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1. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel secured to the trailer box at a fixed position proximate to a trailer box side; anda second fairing panel secured to a mou

1. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel secured to the trailer box at a fixed position proximate to a trailer box side; anda second fairing panel secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to one or more spaced-apart bars or tracks, the bars or tracks mounted to the underside of the trailer box in a fore and aft orientation,wherein the mounting support structure receives the one or more spaced-apart bars or tracks therethrough,wherein the one or more bars or tracks are positioned on the underside of the trailer box such that the second panel is proximate to the trailer box side, and when the wheel set and rear fairing panel are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel, andwherein the second fairing panel is secured to the wheel set so that the second fairing panel can be moved with an adjustment in the position of the wheel set. 2. The side fairing mounted on a trailer as in claim 1, further including an impact amelioration section secured to the lower edge of the second fairing panel. 3. The side fairing mounted on a trailer as in claim 2, wherein the impact amelioration section is a flexible bristle material. 4. The side fairing mounted on a trailer as in claim 1, further comprising a plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks. 5. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel secured to the trailer box at a fixed position proximate to a trailer box side; anda second fairing panel secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to one or more spaced-apart bars or tracks, the bars or tracks mounted to the underside of the trailer box in a fore and aft orientation so that the second panel is proximate to the trailer box side, and when the wheel set and rear fairing panels are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel,wherein the mounting support structure receives the one or more spaced-apart bars or tracks therethrough, andwherein at least one of the second fairing panel and the wheel set includes a mechanical fastener that selectively joins and releases the second fairing panel and the wheel set so that the second fairing panel can be moved with or without an adjustment in the position of the wheel set. 6. The side fairing mounted on a trailer as in claim 5, further including an impact amelioration section secured to the lower edge of the second fairing panel. 7. The side fairing mounted on a trailer as in claim 6, wherein the impact amelioration section is a flexible bristle material. 8. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel, comprising a plurality of panel segments secured to the trailer box, using one or more hand or hand tool releasable fasteners, at a fixed position proximate to a trailer box side; anda second fairing panel, comprising a plurality of panel segments, secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to one or more spaced-apart bars or tracks that are mounted to the underside of the trailer box in a fore and aft orientation,wherein the mounting support structure receives the one or more spaced-apart bars or tracks therethrough,wherein the second fairing panel is secured to the wheel set using one or more hand or hand tool releasable fasteners,wherein the second fairing panel is proximate to the trailer box side, and when the wheel set and rear fairing panels are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel,wherein the second fairing panel is secured to the wheel set so that the second fairing panel can be moved with an adjustment in the position of the wheel set, andwherein the panel segments of the first fairing panel are joined together with one or more hand or hand tool releasable fasteners, and the panel segments of the second fairing panel are joined together with one or more hand or hand tool releasable fasteners. 9. The side fairing mounted on a trailer as in claim 8, further comprising a plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks. 10. The side fairing mounted on a trailer as in claim 8, further including an impact amelioration section secured to the lower edge of the second fairing panel. 11. The side fairing mounted on a trailer as in claim 10, wherein the impact amelioration section is a flexible bristle material. 12. The side fairing mounted on a trailer as in claim 5, further comprising a plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks. 13. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel, comprising a plurality of panel segments secured to the trailer box, using one or more hand or hand tool releasable fasteners, at a fixed position proximate to a trailer box side;a second fairing panel, comprising a plurality of panel segments, secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to a plurality of spaced-apart bars or tracks that are mounted to the underside of the trailer box in a fore and aft orientation,wherein the second fairing panel is secured to the wheel set using one or more hand or hand tool releasable fasteners,wherein the second fairing panel is proximate to the trailer box side, and when the wheel set and rear fairing panels are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel,wherein the second fairing panel is secured to the wheel set so that the second fairing panel can be moved with an adjustment in the position of the wheel set, andwherein the panel segments of the first fairing panel are joined together with one or more hand or hand tool releasable fasteners, and the panel segments of the second fairing panel are joined together with one or more hand or hand tool releasable fasteners; anda plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks. 14. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel secured to the trailer box at a fixed position proximate to a trailer box side;a second fairing panel secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to a plurality of spaced-apart bars or tracks, the bars or tracks mounted to the underside of the trailer box in a fore and aft orientation,wherein the plurality of bars or tracks are positioned on the underside of the trailer box such that the second panel is proximate to the trailer box side, and when the wheel set and rear fairing panel are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel, andwherein the second fairing panel is secured to the wheel set so that the second fairing panel can be moved with an adjustment in the position of the wheel set; anda plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks. 15. A side fairing mounted on a trailer, the trailer having a trailer box and a fore and aft positionally adjustable wheel set, the side fairing comprising: a first fairing panel secured to the trailer box at a fixed position proximate to a trailer box side;a second fairing panel secured to a mounting support structure,wherein the mounting support structure is slidably secured independent of the wheel set to a plurality of spaced-apart bars or tracks, the bars or tracks mounted to the underside of the trailer box in a fore and aft orientation so that the second panel is proximate to the trailer box side, and when the wheel set and rear fairing panels are in their aft-most positions a forward portion of the second fairing panel is proximate to a rear portion of the first fairing panel, andwherein at least one of the second fairing panel and the wheel set includes a mechanical fastener that selectively joins and releases the second fairing panel and the wheel set so that the second fairing panel can be moved with or without an adjustment in the position of the wheel set; anda plurality of slide bearings, each slide bearing securing the mounting support structure to a respective one of the plurality of spaced apart bars or tracks.