Hi Stargazer...Progressive definitely knows I live in an RV full-time. First the camper van, now the 5th wheel. Especially since getting insured through Good Sam's agency, through Camping World. For newbies, Good Sam is another RV organization that you can join. They have many benefits and discounts at campgrounds.
Oh, I had bought a small travel trailer at Camping World in May 2014. That was also insured by Progressive as a full-timer RV. So that is 3 years ago, and they had it for me then. In fact, this is how and when I got insured by Progressive as a full-timer, to begin with.
Good Sam RV club owns Camping World, I believe. They are associated somehow, and have an insurance agency. They also cover motorcycles, etc., but I think they told my friend that you must first have an RV before they will insure other items.
The policy says full-time, as well. Maybe you spoke with an inexperienced agent? By the way, to do it this way, I did not call Progressive directly. I dealt with the Good Sam insurance agents. Sometimes now I do call Progressive directly with questions and no problem with this. It is just that I went through Good Sam to get the insurance with Progressive.