Can someone tell me if this is a good truck for a dumptruck and does it have the dpf and require the urea fuel additive? The one I am looking at has the Cummins Isx. Just wondering if I should be looking at something else for a dump truck. It does have air trac suspension which I am not familiar with and my partner is not thrilled about that he would like to have a camelback suspension. What are the pros and cons of this truck? Any advice is much appreciated.