Sounds like a great trip to take. As for roadside assistance, every Ford has a free 5yr, 60,000 mile roadside assistance included with the vehicle purchase. Even the F-53, the E- series chassis used for the Axis/Vegas and any other Ford brand used for motorhomes. The warranty follows the Chassis, not the owner so if you purchase a unit under 5 years old it will have the warranty. Heres a link to Fords site:
https://owner.ford.com/service/roadside-assistance.html 
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