Sign up here to let us know you want to pull the trailer. Check out our trailering calendar and e-mail firstname.lastname@example.org to set up a time. Snap a picture: Spot the trailer? Take a photo, and post it on social media! Tag us @wabadc using #bikeambassador (on Twitter, Instagram, or Facebook) and you’ll be entered to win a free bike tune-up. Read more about the ATC here! Happy April. We hope to see you on the streets.The D.C. bike ambassadors kicked off the April Trailer Challenge yesterday. Expect a month of amped-up visibility from our bike ambassadors and the friendly, roving trailers to spread the love of bicycling. Want to be involved? There’s a few ways: Pull the Bike Ambassador Trailer: You can sign up to pull the trailer on your own or to an event, or ride alongside the team as support crew.