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If you think about the specs themselves: GCWR is the max combined weight allowable for the vehicle thus you should be able to subtract off the weighed weight to come up with what you can tow at this moment.
I think the manufacturers use GVWR because that gives you the most conservative estimate (assuming the vehicle is loaded up).
Its perfectly reasonable for Thor to not publish a towing capacity: They don't make the chassis and don't want to be on the hook for bad math, or users loading it up wrong--they can just point the finger at Ford (something they seem really good at: pointing the finger).
Look in the trailer/5er forums and you'll find endless discussions on this very subject!
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