I'm pro-diesel, I firmly believe diesel is the way to go if you are towing heavy. I'm pro-GM, Chevy/GMC, very little difference, between these two. Have owned more Chevy's than GMC's. I have owned many dually's, more than the SRW, trucks.
Once you tow 20,000 lbs+ you will know the diesel is the way to go. The exhaust brake is a major plus. Pull the Colorado Rockies, you will see the difference Gas vs Diesel. We once owned a Freightliner sports chassis, with the Mercedes diesel, with the Allison transmission, towed a Chevy HHR behind the SOB 5th wheel, never an issue, passed many Gas burners. However one must decide how much you travel, Diesel is more expensive that gas.
Happy Trails.
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