I'm not sure if "lightweight track pads" is the correct name, but I was watching a tree guy drive a crane over a lawn to get to some trees in the back of a lot in order for the chain-saw guys to do some high-branch trimming, and his crew first laid down these panels to prevent the turf from being damaged by the wheels of the crane. It had rained the night before, so the ground was soft, but these pads did what they were supposed to. I didn't have a tape on me, but I'd estimate each was about 3' x 8' and about 3/4 inches thick. They might have been hard rubber, but they seemed light so maybe they were only plastic. Nonetheless, they appeared to be pretty tough. Can anyone identify what I saw and give me a name and perhaps a source for these.