Kalun
If you had purchased ProE I could have done it for you. I beleive that MSC can work with Inv models and do FEA on a fee for service basis.
http://www.mscsoftware.com
They do this in Oz without the need to purchase the software. What an FEA will do is highlight the joint stiffness and quite often adding a gusset here and there can make a worthwhile difference.
For suspension movement, if you have the ability to do a kinetic evaluation, thats when the fun starts.