SOLIDWORKS Design & Help

a chassis for what ?

https://grabcad.com/mr.cad-9 , what type of chassis, would help some reference images or concept

Any chassis design is highly dependant on its context. You would have to provide more detail to work from.

Do You mean SEMA? As others have said you must specify such requirements as type of vehicle ie. car, truck, 2x4, 4x4 etc.

When the chassis Design is Carried out After OR before the the Force Analyse?

Does Any Criteria for Adaptive Chassis Design For Structure Modification?

work as a structural member, and make it easy to use simulation