We practiced team obedience at a facility that also hosted weight-pull events.
We never tried it formally, but we outfitted Haggis with a custom-made harness and gave it a try one night before practice and the proprietor gave us some tips.
In the second picture Haggis is pulling a large cart, a cinder block, and a large, friendly man. We never had another lesson because our host was killed in a car accident. 🙁