I always look under the truck about 3 times when beginning to lift. Once to ensure a good solid contact, then lift about 6 inches and check again, then about at about a foot. I then just keep a constant eye on it as I lift and try to be careful when lowering.
Sorry to see the damage from equipment malfunction. Guess it happens at times. I have been lucky to to have that happen. I did have a vehicle stolen (never found) that I had a lot of money in.