Not if you own your trailer without a mortgage. If you have a mortgage you're pretty much required to have insurance. Not getting insurance doesn't make this cheaper really as you'll just lose your property completely every few years. Besides insurance rates are often highly subsidized by federal government and actually a really good bargain
I've also heard anecdotes of people draining all their savings/retirement accounts to buy property in uninsurable areas of Florida because they can't get a mortgage. I don't see that working out well long term.