Googled for some images of 16 wheel trucks. Not as common as 18wheels. In addition, they seem to be counting what I think are more like spare tires that do not touch the pavement.
http://www.inetgiant.com/addetails/2...-owner/2312337
http://www.petpeoplesplace.com/petst...812932752.html
http://forums.redflagdeals.com/merge...ruck-648541/8/
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