Modeling three-wheeled vehicle in MSC.ADAMS - how to deal with it?

Hello,
I need to perform an analisys of three wheled vehicle in ADAMS.
It looks like on the picture named "Trike", I have a CAD model of frame and other components, but I'm not allowed to publish them.
Using ADAMS tutorial I've created a template for rear suspension, and it works fine, that was the easy part.
But how to deal with front part? there is only one wheel so I have a problem putting it on the test rig.
Has anybody encountered such a problem before?
I would be grateful for any guidacne, for example a tutorial how to model motorcycle in ADAMS or something similar.
Thank you very much in advance.
Best Regards.