They arent terribly picky from what they told me. They have a "checklist" but they're more or less looking to make sure it really is a camper and not a bus with an air mattress.
Also depends on where you're located. I had gotten my insurance through Good Sam, but because NJ is extremely fussy about who insures within the state, it wound up being with Flo's company. And they dropped me within two weeks.
__________________ Hey! That's not an RV, that's a school bus.
Well thank you for noticing, Captain Obvious Captain Obvious on deviantArt