it is generally not recommended, as this puts excessive stress forces on the plasma glass, so you're increasing your chances of breaking it. i've seen cringe-inducing pictures of the results...not good.
however, if it breaks, i would have to think the service tech/company would be held responsible. still, who wants that headache?
No potholes in your neighbourhood? No "street-calming". PITA hunks of raised/rounded asphalt to roll over on the way to the repair shop?
Anything that could cause a jarring reaction in the car might adversely affect a laid-flat plasma's glass. Too much stress on the glass. If at all possible, transport it upright in the backseat, covering it up with a blanket or somesuch - and use the lap/shoulder belts to secure it.
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