Flat-screen TVs are large but surprisingly fragile because the LCD or OLED panel flexes easily. The single most important rule is to keep the screen upright at all times, never laid flat, since pressure on the glass can crack the display internally even when nothing looks broken. With the right box and a little padding, a TV move is quick and low-stress.
Pro tip: Telescoping TV boxes adjust to fit 32 to 70 inch sets and are reusable, making them worth the small cost.
Watch out: Never transport a flat-screen lying flat. Pressure across the panel can crack the display even if the glass looks intact.