I've used GEICO for yrs on all my vehicles. No problem getting my 2023 Ram Promaster cargo van insured. No questions asked. I did not build it out. Just have in my van what l need to live on BLM land at LTVA. Hope this helps.
I will try to get their quote too, but it might be that you are lucking on the grandfathered in policies. Plus, I heard something about Geico only allowing this if you have another non-van vehicle insured with them, otherwise they consider one living full time in a van and they dropped a bunch of people over this.
I just spoke to several insurance agents today again and they told me the last 6-12 months insurance companies had been tightening their requirements, adding new ones.
Basically, I realized I can not buy Ram Promaster for no-build camping as I planned, because I will not be able to insure it or will have to go commercial for crazy money. It is considered a commercial vehicle (unless turned into RV) by almost every carrier now, plus I have added complication of having no garaging address that I can "prove" to them - I had been traveling full time for more years than I can remember, but stayed in short term rentals or just camped out of a small truck, so I have no garaging address that I can prove with 2 pieces of proof including a utility bill, what many agents started requiring now (it's worse through the Agent than direct through websites, actually, it's Agents that underwriters seem to pester more). They won't accept storage facilities or campgrounds as garaging locations (ha, and I will be living overseas most of the time soon, where am I supposed to mostly "garage" a van other than in storage???). Can't even get commercial without garaging address proof, I was told, plus they give some kind of travel radius and if you're out of it you're not covered.
Will have to go with a different option. May be a small van such as Transit Connect + small cargo trailer or a truck + shell + cargo trailer (small van or a truck shell wouldn't be enough for me to stay in + keep my junk collection + lots of water I need to haul for my long stays in the boondocks). These smaller lighter vehicles are mostly accepted as non-commercial by insurance companies and much easier to insure. Even if I found a company that would insure a Promaster without proof of garaging address required, they can drop me any moment or charge me thousands, I just don't want to be there, too risky. I called a campground that does mail handling for full timers today, they told me their clients face car insurance problems because of their address being recognized, the insurers are starting to squeeze full time travelers.