I've only hauled it a few times and haven't noticed any soot on the camper. It's taken me about 3 years to find the proper sized spirol pins for the old, direct drive landing gear boxes and the brakes don't seem to do much (old Dayton brakes and Fayette style wheels). One day we'll have a better 5'er and I'll see if I get soot on it, lol. I'll have replaced the turn out stacks with bullhauler stacks. Other than liking the looks, they should direct exhaust out and around the front of the camper some more. I usually take it pretty easy when hauling it as it puts a bit of a strain on the N/A 7.3L (need turbo!), so I'm usually not pushing out much smoke. Stacks were on the truck when I bought it, but for the most part it was done well. I can get pics of the system if you want.