I just found these pictures that I took back in January of 2010. You can use Jo's shoe as a comparison to the size of each tread. According to measurements taken then, the 3-step treads were 10" and the 4-step treads were 8".
Terry
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Terry and Jo
2010 Mobile Suites 38TKSB3 #5332 - 2008 Ford F450
Terry's Smugmug Site
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