Before driving an RV off the lot, it will need to be insured. Some auto insurance companies also offer RV insurance, but it may be beneficial to look for an insurance provider who deals exclusively with RVs.
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Roamly is a great option as it offers roadside assistance and covers you if you choose to rent out your RV. They source the best deals from their 10+ insurance partners to find you the best rate for what you need. (In fact, I've had an insurance policy through one of their insurance partners!)