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An adjustable trailer underbody fairing for a trailer having an adjustable rear wheel assembly and a corresponding tractor unit having rear wheels, the fairing including first and second fairing sections attached to the rear wheel assembly and trailer, respectively, and an adjustable fairing panel c

An adjustable trailer underbody fairing for a trailer having an adjustable rear wheel assembly and a corresponding tractor unit having rear wheels, the fairing including first and second fairing sections attached to the rear wheel assembly and trailer, respectively, and an adjustable fairing panel coupled to the first and second fairing sections that extends and collapses as the rear wheel assembly is moved to present a planar fairing surface at all times. The fairing can be selectively raised to provide access beneath the trailer.

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1. A fairing for a trailer having an adjustable rear wheel assembly and a corresponding tractor unit having rear wheels, the fairing comprising: a first fairing section configured for attachment to the trailer rear wheel assembly; a second fairing section configured for attachment to the trailer

1. A fairing for a trailer having an adjustable rear wheel assembly and a corresponding tractor unit having rear wheels, the fairing comprising: a first fairing section configured for attachment to the trailer rear wheel assembly; a second fairing section configured for attachment to the trailer; and an adjustable fairing panel coupled to the first and second fairing sections and configured to extend and collapse as the position of the rear wheel assembly is adjusted longitudinally on the trailer. 2. The fairing of claim 1 wherein the first and second fairing sections comprise a telescopic frame having a first frame member telescopically coupled to a second frame member. 3. The fairing of claim 2 wherein the adjustable fairing panel comprises a plurality of vertically-oriented slats having a foldable panel mounted thereon. 4. The fairing of claim 3 wherein the plurality of slats are slideably mounted to the telescopic frame and configured to rotate about a vertical axis to guide folding and unfolding of the foldable panel. 5. The fairing of claim 4 wherein the foldable panel is constructed of fabric. 6. The fairing of claim 5 wherein the fabric is mounted to the telescopic frame under tension. 7. A trailer assembly for use with a tractor having a moveable rear wheel assembly, the trailer assembly comprising: a trailer having rear wheels adjustably mounted thereon and a front configured for attachment to the tractor; a first fairing section attached to the moveable rear wheel assembly; a second fairing section attached to the trailer to be adjacent the rear wheels of the tractor; and an adjustable fairing panel coupled to the first and second fairing sections and configured to extend and collapse as the position of the rear wheels are adjusted longitudinally on the trailer. 8. The assembly of claim 7 wherein the adjustable fairing panel comprises a foldable panel. 9. The assembly of claim 8 wherein the adjustable fairing panel comprises a plurality of vertically-oriented slats slideably mounted on a telescopic frame formed by the first and second fairing sections, the plurality of slats having the foldable panel mounted thereon. 10. The assembly of claim 9 wherein the plurality of slats are mounted to each rotate about a vertical axis to guide folding and unfolding of the foldable panel. 11. The assembly of claim 10 wherein the foldable panel is constructed of fabric. 12. The assembly of claim 11 wherein the fabric is mounted to the telescopic frame under tension. 13. The assembly of claim 7 wherein the first and second fairing sections and the adjustable fairing panel are attached to the trailer to move as a unit between a raised position and a lowered position. 14. The assembly of claim 7, wherein the adjustable fairing panel comprises a plurality of slats, each slat mounted on a telescopic frame by a top slider mount and a bottom slider mount, each slider mount configured to slide on the telescopic frame and to hold the respective slat in rotatable engagement for rotation about a longitudinal axis of the slat. 15. The assembly of claim 14, wherein each slider mount includes a plurality of rollers mounted thereon to support the slider mount on the telescopic frame. 16. The assembly of claim 7, comprising a first fairing mount configured to attach the first fairing section to the movable rear wheel assembly and a second fairing mount configured to attach the second fairing section to the trailer, each fairing mount comprising at least one cable attached to an actuator on the fairing mount and attached to the corresponding fairing section for moving the corresponding fairing section relative to the fairing mount.