Did you get your new catalog from Highland yet? Mine came last week and I love browsing this thing. I can spend hours and hours looking for just the right tool or thinking up a new phase for my woodworking efforts.
The trick to picking up a heavy sheet with a Gorilla Gripper is to get your hand under the Gorilla handle and fold your arm under the load while you bend your knees, and then straighten your legs to lift the material. Your hand ends up at your shoulder and the heavy sheet hangs comfortably by your side so you can walk with it.