The adjustable height receivers work great when you need to haul different trailers that have different tongue heights. However, I find that if I am always towing the same trailer, it is a simpler and lighter weight solution to just buy a receiver with an appropriate drop for my tow vehicle - trailer combination.
Dave W - 2013 Escape 19' and 2011 Toyota FJ Cruiser
"It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it." - 1907, Maurice Switzer