Why not respond with something like, "I know an RV forum member who told me who the 'trailer trash' really were. In the late '50s and early '60s his mother and father lived in a large trailer they pulled across the US, about eight times. Years later the boy asked his mom, an ER nurse, why one earth they would ever have lived in a trailer. She explained that in those days, rental apartments were typically filthy and full of vermin, really no place to raise a family. With Dad an FAA official, often on the move from contract to contract, it made sense to have a nice clean home of their own, so they purchased a Ford F-100 truck and a big ol' trailer - and got a lot of adventures to boot. When you experience quality care at a busy hospital, or fly coast to coast safely and comfortably, please remember the "trailer trash" in your own community. :)
And that cool old trailer, spotted here in "Hog Wallow NJ" in 1988: