It is all in the specifications and here is the link to your TV:
Ford 2013 F150First, decide if you believe in the OEM's ratings/specifications/limits/etc or not
If not, then academic this
If yes, then read up and learn how all OEM ratings/limits/specifications/etc work. It is a system and note that most only take one spec to then think it applies to all conditions and models....it does NOT
The GCWR is listed in that Ford.com site above
Find it for 'your' TV
Then take the MTWR (max tow weight rating) for 'your' TV and subtract it from the GCWR. 
The will/should be close to the Curb for your TV, plus the tow option, WD Hitch system and one 150 lb driver. Fluids can range from 1/4 to 1/2 to full
The actuary tables list the 'average' American at 150 lbs and is based on old, old tables. Coast Guard has increased theirs to 180 lbs for their rating of the number of passengers that vessel is rated to carry...updated because if that vessel rating is exceeded...folks drown and die...while a TV will just break down and coast to the side of the road in most situations...
Then load up your TV as if ready to tow and weigh it, axle by axle
That total TV weight subtracted from the GCWR will NOT be the curb weight of your TV...
Since most TV's have options, driver more than 150 Lbs, has passengers, cargo, pets, etc...they typically weigh more than their listed curb...meaning the for ever pound more than the listed curb...it takes pound for pound away from the listed MTWR
That is covered with these weasel words in fine print at the bottom of all the ratings/limits/etc charts: "Maximum capability when properly equipped"....meaning a curb (stripper model), one 150 lb driver, tow option, WD hitch system...
SpeakEasy wrote:
camp-n-family wrote:
 Don't forget as well that tow ratings reduce pound for pound with weight added to the vehicle. New ratings include 150lbs each for driver and 1 front passenger. Anything else added reduces the tow rating.
Wait. What???
Someone please explain or fact-check this statement. 
So you're saying that a vehicle that has a 1700 lb payload capacity and 7000 lb towing capacity ACTUALLY has only a 5300 lb towing capacity if payload is maxed out (7000 minus 1700 = 5300)? That's how I am interpreting what you're saying, but it seems odd at best. Please clarify your meaning.
-Speak