Mac Vertical Home Lift PL-50 load

This is a Mac's Vertical Lift model PL-50 being loaded into a truck for installation. No lift gate available no problem. This is the ONLY residential lift built with the customer and installer in mind. The lift weights in at only 400 lbs and this video (and series) will show how easy it is to set up.
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What does it mean when the key position is horizontal?