Strongman Training Limited Equipment

I am a basketball coach, and we are constantly changing our workouts to kill the monotony.
I’m going to try to set up the strongman training recommended by Joe D. this week, but we don’t have access to all of that neat equipment. I do have a sled and access to some pretty big tires. Also, I was thinking that I could get them to throw a 45 lb. rubber weight for the keg toss. Anyway, my question is this:
What are some other effective exercises that can be performed with limited equipment?

Push and pull cars, vans, etc.

Sandbags are great and kegs are actually quite easy to get and convert. Big rocks and pulling pushing cars various ways.

Wheelbarrow walks-with partner as added weight.