Leg-carriage type trusses

A truss section, said truss section being elongated and having two ends, each of said ends suitable for mechanically coupling said truss section with another one of said truss sections, said truss section having an elongated central axis extending between said ends, and having first and second sides substantially parallel with one another,

• said first side comprising:
• a first elongated chord, said first chord extending between said ends, said first chord being substantially parallel to said elongated central axis,
• a second elongated chord, said second chord extending between said ends, said second chord being substantially parallel to and spaced apart from said first chord,
• first cross-members mechanically connecting said first chord with said second chord,
• said second side comprising:
• a third elongated chord, said third chord extending between said ends, said third chord being substantially parallel to and spaced apart from said first and said second chords,
• a fourth elongated chord, said fourth chord extending between said ends, said fourth chord being substantially parallel to and spaced apart from said first chord, said second chord, and said third chord,
• second cross-members mechanically connecting said third chord with said fourth chord,
• the intersections of said first and said second sides with said ends defining four corners of said section,
• said truss further comprising:
• third cross-members mechanically connecting said first side and said second side,
• first and second leg carriages, said leg carriages being separable from said truss and from each other,
• said leg carriages each having at least a first and a second elongated leg,
• said first and said second leg having a cross sectional shape,
• said first and said second elongated leg each having one and another end and an elongated axis extending between said first and second ends of said leg,
• said leg carriages each having an additional elongated structural member having first and second ends, and being attached at said first end to said first leg proximate to said one end of said first leg, and being attached at said second end to said second leg proximate to said one end of said second leg,
• each of said leg carriages having at least two casters, one of said casters being attached proximate to said one end of each said legs,
• at least four sleeves, each of said sleeves attached to said truss and each having an elongated axis and a cross sectional shape, one of said sleeves in each of said corners, said elongated axis of each of said sleeves parallel to said sides and to each other, each of said sleeves dimensioned to accept insertion of said another end of one of said elongated legs,
• said sleeve and said leg having in their cross sectional shapes when said leg is inserted in said sleeve a larger clearance between said leg and said sleeve in a first axis that is parallel to said elongated central axis of said truss section than in a second axis that is perpendicular to said elongated central axis of said truss and to said elongated axis of said leg.