Place the glass down flat on the ground and cover the entire pane with an old blanket or several old towels to keep the shards in place before using a hammer or shovel to break the pane.
How to safely take off sheet of glass from table.
Lift 1 corner of the glass with your fingernails.
If so as your other contributors suggest.
Rest one end of the unbroken sheet of tempered glass on top of the stump or block.
Dig down with your fingernails until you find the bottom of the tempered glass.
If the glass is heavy use a suction cup for your lower hand.
Always wear gloves with rubber coated palms.
If the path from the truck to the window is smooth use a glass dolly.
Two to lift two to receive.
You should be able to barely get 1 corner away from the surface underneath it.
Use your upper hand without a cup as a guide hand to maintain balance.
Heavy plastic bags would probably work well.
Therefore it must be either laminated glass two layers of glass with a clear interlayer between them which it adheres to or ordinary annealed glass.
Mark clement moving big glass up staging requires four workers.
Wrap it in a sheet use hammer rock large book etc to break up and then bundle the old sheet into the trash can.