OP you fell into the MFG. Magical Tow Rating marketing gambit....
Everyone looks at the mfg. tow guide...checks the 'tow rating number' but don't dig in a little deeper and find/read the FINE print.
Maximum trailer weights in pounds for properly equipped vehicles with no cargo
May vary depending on model, trim and/or powertrain.
Maximum Loaded Trailer Weight assumes a towing vehicle with any mandatory options, no cargo, tongue load of 10-15 (conventional trailer) or king pin weight of 15-25% (fifth-wheel trailer), and driver only (150 pounds).
Weight of additional options, passengers, cargo and hitch must be deducted from this weight.