my experience is that the length is measured from the front of the hitch to the end of the spare tire.
the hitch length from the box is 3'6" + the bumper is 6" from the box + the spare tire is an additional 1'.
so, generally for the mini lite series, you have the box length + 5' with spare tire included.
that means this particular unit's box length is 21'8' minus about 5'.
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'08-Rockwood 1809 Mini Lite
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