It appears to me that driving the truck for a longer distance at greater sustained speeds than some others are driving them has helped me to not have any troubles with the DPF, turbo and/or other emissions equipment related problems.
If possible try to drive it ocassionally at highway speeds to minimize the possibility of problems down the road.
Mark
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Mark's '07.5 Megacab 2500,6.7L,6 Speed Auto/Stick,Buckets w/ full Console,Engine Brake,Stampede Brand Vent Visors,Bugshield,Headlight Eye-Brow Covers,Bedrail and Tailgate Covers w/ Anchors,3rd-Eye Brake Light Cover,Lighted Hitch-Cover,Hi-Beam AND Foglights enabled