Originally Posted by into-the-RV
I'd be worried about possibly getting those black shadows you see on the trailers pulled by commercial semis.
into-the-RV, I have not seen many p/u trucks with stacks and I expect that you indeed have a valid concern.
Now those OTR trucks run many thousands of miles 6 to 7 days a week unlike RV'ing which on the average an owner may only clock up 3,000 to 5,000 miles per year. I would not be too far off track if I suggested that you should not see intense streaking however I would keep an eye on it.
If you have a 2007 - 2010 truck the exhaust plume itself would be significantly cleaner as well due to the emissions controls.