They can’t stand up to high winds well. If the tornado hits a mobile home park the place is too often flattened, and also, sadly, there sometimes are multiple deaths. One tornado can blast through in a matter of minutes and kill 50 people. From what I understand, if a tornado is coming you are supposed to leave a mobile home and ride out the the tornado in a ditch. I wonder how many people actually do that?
Tornados give little warning, and carve crazy paths through towns. Maybe mobile homes are more likely to be in rural areas on open land that is prime for tornadoes? I don’t know if that’s statistically true, but it seems to fit.
In Florida I always find it ironic that you can’t build a house without spending a lot of money meeting wind codes, but you can buy a new mobile home that doesn’t meet wind codes, and is extremely vulnerable in bad wind storms. Don’t get me wrong, I’m not saying mobile homes shouldn’t be allowed, they provide shelter for many people, and some of them are pretty fantastic inside.