G not sure what you mean here - perhaps a redescription might get you more replies Martin

Hi Systemrisk. In a normal racking structure the change in configuration from three beams to two beams should not make a huge difference, as long as the height from the floor to the first beam level does not change. To be more specific I would need to know the height of the rack, how many bays are in the run, the old beam pitches, the new beam pitches and how the racking is fixed to the floor?