Has anyone even considered something called "The Bottom Line" and "Profit Margin". Which is less peices to include in the kit and thus costs them less to make the kit; a crashed car or truck or a crashed bicycle? The little bike is like just a few small pieces of plastic. To make a car that crashed would be a lot more pieces in the kit and they would either have to charge more for the kit (and thus sell fewer of them) and/or take a hit on the profit margin. A guy on a bike is probably the least expensive thing for them to include as something that had a somewhat believable crash that need to be taken to the hospital by the ambulance.
Although I do agree an ambulance chasing lawyer would have been a nice bonus addition but they they would have all the lawyers up in arms about including one of them in an ambulance kit as an ambulance chaser.