Originally posted by @Brennen McConnell:
The suppliers say they are familiar with building codes in the US, but I still imagine there would be a lot of work to ensure code compliance, as well as installing the home on a new foundation, connect to utilities, etc.
I highly doubt a Chinese modular home manufacturer is going to be even remotely familiar with US building codes. Every state, county, and city is different. I can guarantee you this will not be as simple as buy and assemble.
My advice would be to see if you can purchase the plans only. Take those plans to the county you intend to assemble the modular home and ask them if any additional construction would be needed to meet current building codes. This gets rid of all the guesswork for you.
Also, keep in mind that not all of these "kits" will give you a finished home. Is this just a frame? Does it include plumbing and electrical? What about interior finishes? These are all questions I would be asking myself.