Set floor size, then add shipment lines. Packing uses the same grid rules as the trailer planner.
Square floor: side = √area. Racking may reduce usable pack width.
Open floor packs east of the strip with Floor first mode: fill the slab before stacking.
Live preview — adjust floor and racking, then run Plan floor to pack pallets.
Floor first fills the open slab before stacking. Rack column estimate splits the open floor into lanes aligned with each bay (not storage inside the rack).