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A trailer has a frame having frame-members configured to support a container, at least a pair of traction devices rotatably mounted on the frame, and a tongue configured to be mounted on a transportation device or an implement being towed by a transportation device. The frame-members may have a thre

A trailer has a frame having frame-members configured to support a container, at least a pair of traction devices rotatably mounted on the frame, and a tongue configured to be mounted on a transportation device or an implement being towed by a transportation device. The frame-members may have a three-point mount configured to support a container. The container may be configured to be interchangeable with another container. The container may be an element of a seeding apparatus, the seeding apparatus mountable on the frame-members of the frame. The trailer may have a steering mechanism for the traction devices, and may be convertible between steerable and non-steerable modes. The steering mechanism may be guidance controlled. A transverse distance between the traction devices may be adjustable and/or height of the frame in relation to the ground may be adjustable. The trailer provides greater flexibility of operation under a greater variety of conditions.

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1. A steerable trailer comprising: a frame having frame-members for supporting a container;at least a pair of opposed traction devices rotatably mounted on stub axles, the stub axles mounted on a length adjustable transverse axle bar mounted on the frame, the opposed traction devices having an adjus

1. A steerable trailer comprising: a frame having frame-members for supporting a container;at least a pair of opposed traction devices rotatably mounted on stub axles, the stub axles mounted on a length adjustable transverse axle bar mounted on the frame, the opposed traction devices having an adjustable transverse distance therebetween;a tongue pivotally mountable on a hitch tube of a transportation device or an implement being towed by a transportation device; and,a steering mechanism for the traction devices, the steering mechanism comprising a 5-bar linkage assembly in which five linkage arms are connected at pivot points so that the five linkage arms are moveable relative to each other, the five linkage arms comprising the transverse axle bar, a first stub axle linkage, a second stub axle linkage, a first tie rod and a second tie rod, wherein the first stub axle linkage is pivotally mounted to the axle bar, the second stub axle linkage is pivotally mounted to the axle bar, the first tie rod is pivotally mounted to the first stub axle linkage and the second tie rod is pivotally mounted to the second stub axle linkage, and wherein three of the five linkage arms including the axle bar and the tie rods are length adjustable,a common pivot plate on which the tie rods are pivotally mounted,one or more control rods pivotally connected to the hitch tube, and pivotally mounted on the common pivot plate at a position on the common pivot plate longitudinally forward of where the tie rods are pivotally mounted on the pivot plate,wherein the traction devices turn in a direction opposite turning of the hitch tube when the transportation device is turned. 2. The trailer according to claim 1, wherein the stub axles are mounted on the stub axle linkages thereby pivotally mounting the stub axles on the axle bar, the traction devices mounted on the stub axles turning in response to pivoting of the stub axles. 3. The trailer according to claim 2, wherein pivoting of the pivot plate causes the tie rods to translate and translation of the tie rods causes the stub axles to pivot thereby turning the traction devices of the trailer. 4. The trailer according to claim 3, wherein longitudinal movement of the one or more control rods in response to turning of the transportation device causes the pivot plate to pivot. 5. The trailer according to claim 1, wherein a height of the trailer in relation to the ground is adjustable. 6. The trailer according to claim 1, wherein the axle bar comprises one or more disconnectable connection points into and out of which one or more spacers are insertable or removable to lengthen or shorten the axle bar to adjust the transverse distance between the opposed traction devices. 7. The trailer according to claim 6, wherein the one or more disconnectable connection points and the one or more spacers comprise mounting plates that are attachable together. 8. The trailer according to claim 5, wherein the axle bar is rigidly mounted on the frame, and the stub axles are mountable at different vertically-spaced locations on mounting plates proximate each end of the axle bar. 9. The trailer according to claim 8, wherein the axle bar comprises one or more disconnectable connection points into and out of which one or more spacers are insertable or removable to lengthen or shorten the axle bar to adjust the transverse distance between the opposed traction devices. 10. The trailer according to claim 1, wherein the steering mechanism is disableable to convert the trailer to a non-steerable trailer. 11. The trailer according to claim 1, wherein the traction devices comprise wheels.