You don’t need to legally get insurance for a static caravan, but some holiday parks will make it a condition of siting your holiday home with them.
In any case, getting static caravan insurance makes total sense for your own peace of mind.
Expect a typical static caravan insurance policy to cover internal and external damage due to fire, leaks or weather, contents theft, public liability and with some policies, renters damage.
The cost of static caravan insurance is very reasonable for the value of your beloved holiday home!