Collision coverage is limited to the actual cash value of the vehicle, and requires a deductible, which is the amount you'll need to pay before receiving benefits. Higher deductibles lower your premium but increase the amount you must pay out of your own pocket if a loss occurs. Ask yourself how much you would be willing to pay on short notice in order to save on your premium, or talk to your agent.
However, there are some circumstances where RV insurance is always required, even if it’s a towable model. For example, if you’re renting or financing your RV, both renters and lenders will want to make sure that they’ll be properly reimbursed in case of an accident or loss, and will require you to acquire an insurance policy before allowing you to take them on the road.