I insured my 4104 with my regular auto insurance company. I never said it was a bus, I told them it is a motorhome which is the way it is registered. Motorhome is the key word, don't even say bus if you don't have to.No problems or questions of any sort and my ins co won't insure a truck more than one ton??
I would be concerned how they would handle it if a claim ever had to be filed on it.