Guess I'm just lucky. Living in Colorado, and pulling in the high country all the time, there was no stress or question about the added value to buying a diesel. Never even gave it a second thought as there is just no comparison between the two for towing here. The cost of gas vs diesel when filling up the tank is only a few dollars different, so that is pretty much a wash, as well as the 10-11 mpg vs 6-7 mpg while towing more than covers the price difference at the pump.
There is also the added bonus of the longevity of the diesel. Vehicles don't rust out here, so the rest of the truck will last as long as the engine. Will I ever recoup the cost difference from a gas engine? I don't know and don't care. I do know I bought the best tool for the job!
Becky, Bob and Taylie & Bode
2009 Silverado 2500HD Duramax/Allison
2014 Heartland Sundance XLT 245RL