I converted in Michigan last summer. You need a permanently installed toilet, sink, refrigerator, microwave (or other form of cooking), bed, and separate HVAC from truck. I titled as a motor home and paid the registration based on the truck purchase price. The secretary of the state just requires a signature saying you have all of the items listed above and your out the door. No inspections. They did say that dot or a state officer could ask to inspect the truck if you are pulled over. I had some issue with insurance because all of the companies stated that I couldn’t have a fifth wheel hitch. I ended up with farm bureau and they were great. I can look through my info if you need more details. After it was all said and done I pay less to drive the truck than any of my other vehicles.