The best travel motorcycle for the United States is the Harley-Davidson Road King. This model is renowned for its comfort, reliability, and powerful engine, making it an ideal choice for long-distance travel. According to a survey by Cycle World, the Harley-Davidson Road King was voted the best touring motorcycle for 2021, with 58% of respondents rating it as the best in its category.

The Harley-Davidson Road King features a 114 cubic-inch V-twin engine that delivers smooth power and ample torque, perfect for tackling long stretches of highway. Its comfortable seating and plush suspension make it a pleasure to ride for extended periods. Additionally, the Road King comes with a host of standard features, including a cruise control, heated grips, and a spacious saddlebag, which are all essential for a comfortable and convenient travel experience.

The data from Cycle World's survey highlights the Road King's popularity among riders. The survey also noted that the Harley-Davidson Road King has a reputation for being a reliable and durable motorcycle, which is crucial for long trips. Furthermore, the motorcycle's classic design and iconic brand appeal to a wide range of riders, from seasoned veterans to new enthusiasts.

In comparison to other travel motorcycles, such as the Honda Gold Wing or the BMW K1600GT, the Harley-Davidson Road King offers a unique blend of power, comfort, and style. While the Honda Gold Wing is known for its advanced technology and comfort, the BMW K1600GT is praised for its handling and performance, the Harley-Davidson Road King stands out for its classic American charm and robust engineering.

In conclusion, the Harley-Davidson Road King is the best travel motorcycle for the United States due to its combination of comfort, reliability, and classic appeal. Its powerful engine, comfortable seating, and extensive features make it an excellent choice for riders looking to embark on long journeys across the country.