Good points all. My brother just bought and moved into a manufactured home. After decades of apartment living, he is thrilled not to have to share walls. I toured the place and it’s more tightly constructed than my stick house.
I’ve been in a few modular home factories. Many are very impressive in manufacturing techniques, materials and workmanship. Others are cheap trash.
I was in one recently that featured some building materials generally used only in high end houses. Seeing that alone would encourage me to buy one of their homes were I in the market.
I believe in the market for low, medium and high end homes. Everyone should equally be able to buy what their income allows for.
When I was a kid, my aunt lived in a mobile home park on the waterfront in Detroit. It was a very neat little community of interesting people.
My parents moved out of their stick built, 1958 vintage. They moved to another state and my dad ordered a double wide with 6” wall studs, argon filled double pane vinyl windows, 2300 sqft and metal roof for 60K back in 99. Far north western NM with much colder winters and they used less energy to heat it than we in W. Texas in a 65 stick built house. Their place was very well insulated, very quiet and well built.
So yes, well built house trailers are available but they do cost more for the custom better qualities.