I haven't used one personally but have read posts by plenty over the years by folks that have on several different forums.
I see it as a solution for use say at your house or other unique situations.... not a dump station tool.
I think they make sense if you need to span a distance or go slightly up hill....but for the typical dump station it's like a solution in search of a problem. Seems like it adds time and complexity...and makes others waiting in line behind you at the dump station wait.
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