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on height, you really have to consider how much snow you will be pulling threw. To low and now you have a plow
I just built a sled myself and found some youth skis that worked perfect, I didn't have to cut any length off of the end. If you are in the Quad City area I can tell you where I found mine. I found the thrift stores wanted anywhere from $5 to $25 for a pair of skis.