My boyfriend and myself travelled around the United States for six months last year and we found it much cheaper to buy a small RV and then sell it at the end. It is slightly more trouble but we managed to find a dealer online and they helped us with all the relevant registration required when we arrived. Obviously be careful but if you can spare a few days at the start and end of your trip to look for a vehicle you will end up saving a fortune. Even with the vehicle insurance we had to take out a full year policy but got six months refunded when we left (we paid about £300 for the whole year for two people driving a nine-tonne RV). For travel insurance we went with Endsleigh and they were very reasonable and flexible (you can extend your policy or add just a few days or sports cover).
Is this your business?