FYI- When I worked with my insurance company after a total loss of truck and camper, I was glad I had a RV policy on my FWC Eagle. The way they settled the claim was that they found 3 comparative slide in campers, similar age, size, options, that were for sale by contacting dealersand then we negotiated a settlement. That might be a problem for you with a DIY build. Be upfront with them and get everything in writing. You also will want to document every nickel you spent building the unit. I had to produce receipts and photos of any modifications I made, such as solar panels, compressor refrigerator. I have my coverage thru Good Sam $284 a year. The other consideration is that my truck policy didn't cover add ons, or personal property the camper policy did, for example, I had to replace my Cpap machine and the RV policy replaced it, the truck policy would not have. The Cpap cost me $450, I purchased a new one and submitted a receipt and they paid it under the personal property section of the policy.