Bell crank force analysis help request.

I'm in the process of doing a structural analysis of a bell crank I have designed, however I need to make sure I'm applying the correct forces and boundary conditions. I have attached an image of the problem to hopefully give you a better understanding of what I'm doing. I need to work out and apply the forces for the most extreme case. My method of working so far has been to sum all the forces in the y direction, then sum all the forces in the z direction and then finally take moments about the tire contact patch and rearrange to determine the force at the bell crank. However, I end up with too many unknowns to solve for the forces. I've searched all over the place for answers with not much luck. Any help in the right direction would be appreciated. Links to books or webpages?

The image shows a pullrod suspension system connected to a bell crank, connected to a damper. Imgur