Structural Analysis
When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

the head of the load reaches the section
the load position should be such that the section divides the load in the same ratio as it divides the span
the load position should be such that the section divides it equally on both sides
the tail of the load reaches the section

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Structural Analysis
The effective length of lacing is the distance

All of these
Between the inner ends of effective lengths of welds connecting the members
0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner end rivets of the bar for single lacing

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