If we are talking a semi trailer and it has e-tracks in the walls we use to run load bars from wall to wall to "deck" the trailer or make a 2nd floor. We have loaded 2,000# or so of pallets (side by side) on two load bars when we hauled rubber/silica. Trailer was grossed out 46,00# in the box. If you hook you bars into the e-tracks it will probably support the weight. The issue is unless you do something to prevent the clothes from hopping or swinging they will be on the floor. If packed tight enough you might get away with it. If you put a square load bar right above your cloths bar it might lock them on the clothes bar.
Google E Track Style Decking Beam Cargo Bar & Load Stabilizer WORKING LOAD LIMIT CAPACITY LBS. 2200 (evenly distributed loads); 6600 Breaking Strength
If you tied your clothes bar to the e track bar you might support it and lock the clothes in place.
Hope that helps