my best home made jumpy right now, was logs and a few chairs. ( made cross rails out of the logs using the chairs. and i used 4 barrels, 2 to lay down with logs on either side to keep them from rolling, and 2 standing on the ends of those for a barrier and then i used to more logs to make a "chute" to the jump. and they work great for me. i am in the process of collecting tires atm as well. i am going to lay 3 flat on the ground and stand some up in the center of those.
Baby, Sparta, Carmen, Henry, Hooch, Mercedes, Butterscotch