My first thoughts were this is not really a usable hitch even though the hitch ball was huge ... the hitch itself was not very sturdy.
So I figured someone was either trying to make a statement or has an envy.
I just found out what it is ... it is a hitch receiver
cover ( http://www.etrailer.com/p-V53300.html )
Or you could try these hitch receiver covers http://store.uhaul.com/master_product_detail.aspx?id=267