<http://schema.org/category>
"Travel Trailer"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.rvusa.com/rvs-for-sale/2017/dutchmen-travel-trailer-lite-2611bh-two-bedroom-slideout-travel-trailer-new-williamstown-new-jersey-08094-1928620>