You are allowed to ride your roadsurfer across the USA and Canada. The only exception is Death Valley, from June 1st until September 30th. If you still want to visit this region, it is best to use alternative means of transport.
You can also do one-way trips between different North-American cities, including Vancouver! Please keep in mind that, if you are planning a crossborder-trip, different pick-up / return locations may apply. But don't worry, you will have all the info in your booking confirmation 😊