Our retirement plan which includes rv insurance

I would like to travel the United States and even up into Canada one day after we retire. We would like to do what many retired married couples have done in the past and purchase an RV. My husband would like to have the one that looks like a Grey Hound bus. That would be nice, but I do not think that we are going to need one that big. Unfortunately as with everything else we will be forced to purchase rv insurance.