I definitely agree with those who want to get explicit coverage for their camper (if they want it covered). We had a similar situation with our camper where the insurance agent insisted that it would be covered with the trucks comprehensive insurance without an additional charge, we then had a pretty significant hail storm that did a bunch of damage to the truck and dimpled the roof of the camper and broke the flexible solar panels. When we filed a claim with the insurance, they covered the truck with no issues, but not the camper. Of course the agent had never provided anything in writing, so her claim to us about it being covered with the truck was meaningless.
I am not sure we would have even had the camper fixed, as the roof didn't leak and it seemed like the roof replacement would not be as well done as the factory roof, and it wouldn't be worth the fight with insurance and agent and then the hassle of finding someone they approved of to do the work.
We now just have direct insurance, which is significantly cheaper, and assume the camper is not covered (which is fine by us).