Hi we are new to biking with a trailer. So I thought we'd buy a used one. We an 2005 Trek Doodlebug and it looked great. Took the Doodlebug out for a spin and the hitch connection to the rear wheel kept making our quick release loose. HELP! We tried it on my husband bike as well and the same thing happened. Are we doing something wrong as we followed the directions, or is there something wrong with the Trek trailer hitch? It made for an unsafe ride to say the least and ended up walking back to the car.