Hoss, yes you can clamp to the tailgate or even to a metal brace inside the tv chassis, the electricity wants to go to a metal ground even if it has to go thru you to get there. Vcr's and other electronic's like that are not real dangerous, because most of them run off of 8v or 12volt on the boards, but tv, 'puter monitors and anything else with high voltage has something around 10,000 volts running around, so you just have to treat them with a little respect. My tech that repaired CB tube type amps for me got himself popped right off his bench he was working at. He came back from lunch and forgot to take off his wedding band, and the next thing I heard what sounded like a 22 going off and it bounced him off a wall about 6 feet behind us. The spark jumped 5" across to his wedding band AFTER he had already discharged it once. Like I said, it is a hard lesson to learn.
PS; The clamps can be smaller ones like they use on battery chargers, in fact if you scrap one out, borrow the clamps and just keep it in the truck with you or your toolbox. Play safe boys and girls,,,
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