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I am getting a 24inch deep, 7.5 foot desktop with 15inch wide base cabinets under each end. This leaves an unsupported span of 5 feet. I plan on using a plastic laminate or hardwood laminate top (made with particleboard under the top surface and a hardwood edge in front) and supporting the entire back of the desktop with a 2x4 screwed to the wall. The dealer says this will be fine, but she isn't very convincing. Do you think the front of the desktop will sag over a long time.
Also, the desktop will have two 30inch kraftmaid drawer units screwed to the bottom.