Edward, I don't disagree, but I will also tell you that my 10 years of association with equine activities at multiple facilities proved that it's an unfortunate reality for farm owners who need to maintain the surface of their arenas while they are working that pass right at the edge of the fence. Most folks don't run with the FEL elevated other than right in the place they must to clear said fence in a corner. Very few have dedicated machines to pull the surface conditioning tools, but those that do often use 4 wheel utility vehicles instead of tractors. Personally, I keep my FEL as low as the situation permits for the obvious safety reasons.
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The most expensive tool is the one you buy "cheaply" and often...