The cost to rent an RV one way is prohibitive, and I don’t know of too many companies that will rent a one way, or even a two way trip to a person with an international license, ie, England. The liability for these companies are extremely high, because there is no jurisdiction over an accident, fire, theft of the RV- if you decided to get on a plane and go home without satisfying a judgment in an American court of law. Your best bet for your money is to rent a car/van with a hitch, when you get to your primary starting point, buy a cheap sleeping trailer camper with accommodations. Once you have completed your trip, you can sell the camper to any use trailer lot and return your leased car/van to its proper leasing company. Mission accomplished and you didn’t spend unnecessary monies because you came from England. When you get back to NY, you have to buy me a beer. Cheers mate!