"It's hard to find information about systems-built houses. ... and it's not [a]common [term] outside the construction industry. ... a homeowner [is] likely to search for "manufactured house," ending up with a lot of info about what used to be called trailers.
I know this because the first time I tried to find information about "pre-fabricated" houses on the Internet, that's exactly what I got: lots and lots of photos of double-wides. When I changed the search term to "modular house," however, I had much better luck."
Link: Marjie O'Connor: The Buzz on Building -- Systems-built Houses (HGTVPro.com)