Hi,
One park that I was a member of used to require blocks under any jacks. The hydralic leveling jacks made by HWH where only about 4" square, and could punch a hole in the asphalt. Trailer hitch jacks can be 2" diameter and drill a deeper depression where they are unhitched, unless there is a wheel, and even that can leave a depression. So they require leveling jack supports under everything now.
In some very scenic and not so level state run campgrounds, I have had to use 4 levels of boards below certain tires, and also the same number under the hydralic jacks that I have.
Fred.
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