08. Stay away from RTI ramp competitions with any GM HD truck--they're just not made to flex. That doesn't mean you have to keep these late-model 4x4s on the street. The optional, integrated Rancho aluminum skidplate will protect the frontend components through the roughest IFS bashings. These Duramax and 8.1L-equipped trucks have a ton of power, and with a Rancho lift and larger tires you can put that power to the trail, not just to the trailer.