I have found similar disparaties and even greater $6000) between different companies when shopping insurance for our 2019 DS and for two years I have shopped hard.
My conclusions are:
1. Companies weigh variables differently
(Driving record, age, number of drivers, claim history, etc)
2. Companies may very likely raise your rates upon renewal for no reason other than to see if they can up it by you. (Some people just pay their bills when they come due, too busy or lazy or wealthy or can't be bothered to
look at last year's premium, especially if they have had no i cider for their insurance to go up.
3. If you are sure all things are equal and both national brand companies, go with the least expensive company that you have researched regarding RV insurance. (Resonsiveness, assistance, promptness in payment, etc)
2019 DS 4018 (Spartan), Nighthawk
2015 Jeep Wrangler Sahara