Road Glide
Best for: Long desert stagesFrame-mounted fairing cuts crosswind buffeting through the Texas panhandle and the Mojave. The fixed fairing means the bars stay light at speed — a real advantage when the wind is trying to push you across your lane for 200 miles.
Watch: Heavier at low speed in town; plan your parking.
Street Glide
Best for: All-round comfortThe most popular Route 66 hire for good reason. Batwing fairing, relaxed ergonomics, enough audio for the long straights, and a seat that is kind to you past Day 3. The fairing turns with the bars, so wind pressure is felt more than on the Road Glide.
Watch: Crosswinds push the fairing; grip it, don't fight it.
Heritage Softail
Best for: Style & lower seat heightIf you want the photo and a lower seat height for flat-footing at stops, the Classic delivers the Route 66 look. Leather bags and a windscreen you can remove for the clean shots. Less weather protection than a Glide.
Watch: Pack lighter — leather bags are smaller than hard panniers.
Road King
Best for: Versatility & luggageA windshield you can pull off in an hour, hard bags for real luggage, and a ride that stays comfortable from Springfield IL to Santa Monica. The default "do everything" Harley and a sensible pick for first-time US riders.
Watch: No fairing audio — bring your own comms/music setup.