If you can swing it, the diesel makes it all so much less stressful. The constant shifting and high revving of the gas motor drove me nuts. The diesel and Allison is a no fuss way to get the job done. I pull a TT that's about 9500# loaded, and although it's not as brisk as when not towing, the truck feels as though it barely knows it's there.
I use mine so little for towing that I often debate it's worth, but each time I tow my TT or utility trailer I'm reminded and it tides me over till next time.
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