The cable will hold way more than you think, the tailgate would probably bend/ buckle before the cable would. Look up wire rope strength and look at some of the charts. Stick with the manual!
The shop should be insured and his business insurance should cover it. Take it to a professional body shop to get repaired, make sure you are comfortable with their reputation and quality of work. Get REFERENCES!!!
Does the Homelink work if truck not on? I don't want mine to work if truck not on, I park outside so if someone gets in the trk they can get in house. May have to run Hot wire to a different power source. Thanks.
I called Ford Customer Service several times while waiting for mine and always got answers, Not always the answer I wanted but ALWAYS pleasant, courteous and informative.