Wow that video content is amazing. I wonder where or how I can try that out.
Thanks for the idea.
If your local gym doesn't have that piece of equipment you can buy a harness and sled from Amazon or other exercise retailer. The weights can he found at most any sporting goods retailer.
Another option is to attach a harness to a tire and add weight to it.
Check out his YouTube channel. Lots of great content with additional exercises.