Ten states do the inspections in the factories in their states: Arizona, Colorado, Florida, Georgia, Idaho, Nebraska, New Mexico, Oregon, Tennessee, and Washington. The private companies are HWC, NTA (NTA, Inc), PFS (PFS Corporation), RADCO (Resources, Applications, Designs & Controls, Inc), TRA (T.R. Arnold & Associates, Inc), and ULI (Underwriters Laboratories, Inc).
ULI has been around forever--you will see their initials on labels on pre-1976 mobile homes because they did inspections for the voluntary industry code back in those days. That does not mean a home built prior to June 15, 1976 with ULI on a metal tag will meet Fannie Mae, Freddie Mac and HUD requirements. Only that is was built to the voluntary industry building code and not just what mood that factory was in that day.
And I strongly urge anyone to take Rich's class when it comes near them--if not travel across the country for one!!!!