When Cal and Marla Clevenger bought an old wagon at a Nampa car lot, they never considered that it would evolve into Wagon Ho, an effective teaching tool about the early days of the West. In the spring, the Clevengers (“Mr. and Mrs. C” to kid participants) host around 40 school programs, teaching kids in the state how the pioneers survived the frontier 150 to 200 years ago. They talk about Lewis and Clark’s famous journey alone the Oregon Trail - “It wouldn’t have been possi