Ford puts out a document called, in this case, the "2015 RV & TRAILER TOWING GUIDE". It issues this document every year, for every truck (or pseudo-truck) in its lineup. Instead of a single-sheet summary of a few specs, this one runs 32 pages, and has a lot more info. Since it covers the entire lineup, many of these pages are not relevant to you - but then, many of them are. It should clarify some of the confusion you are getting from the single sheet.
You (and all Ford owners) would do well to look through this document. Just Google "2015 Ford Towing Guide" (obviously substituting your year of interest). It will come up as a PDF file, which you can print if you desire.
I've had Ford tow vehicles for almost 20 years, and always found this document to be worthwhile.
By the way, on the single sheet, I think STD means that the item comes as standard on this specific model of the truck. The X means "available as an extra cost option". And the dash means "not available no how no way".
Bill
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