I live in a mobile home - well, they call it a "modular" home
it's a double wide and I absolutely love it. It is smaller than our old house and more open and bright looking. Granted, single wides are not my favorite choice of living quarters, but a double wide is a very nice home, IMO. But, even a single wide is good enough if you have good land and outbuildings!!!
I've seen very nice mobile homes and very "trashy" looking ones - depends on how you keep the yard and the mobile home looking.
Tornados do give me pause, we don't get too many, but our first winter here we had one pass a couple miles over. What folks do here is build storm shelters - nothing huge or fancy, they have concrete inserts you can put right into the ground, now - enough room for a family and house pets. Dig out with a backhoe or tractor, stick in your conrete insert, then back fill and pile over the top - you can even plant grass or flowers over it when you get the dirt back.
I don't have one, but I've been considering looking into it. We have a concrete milk barn up the driveway, so we go to it when a bad one is coming. I'd love something closer and less "ick" inside. If we had to, our neighbors have a basement and they told us to come down anytime we felt we needed to.
Look at it this way - land/barn/chickencoop/fencing costs more than a house trailer - if the trailer turns out to be bad, simply replace it somehow - you can get good used ones cheaper than new.
I'd go for it
meri