Angle iron or oak?
The center across the 24" dimension is close to 1/2" lower than
the outboard edges. *The deflection is more than enough to deflect the
center vertical axis of the casters so the thing won't roll.
You could consider also consider trussing it with a steel rod that is
threaded on each end much the way that step ladder threads are
strengthened.
- mkaras
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