diesel or gas

[WSSix]

So here is my dilemma. I'm cheap and want to be good with me money. I'm in the market for a new truck. Well, new to me anyway. I love my trailblazer but I need an open bed truck. I want a CC Silverado 2500. I want this truck to be the last vehicle I purchase aside from toys and projects. I want to be able to pull my TA on a trailer behind the truck. 99% of the time, at least at this point in my life, I'll be hauling air though and I don't see that changing any time in the near future.

I'm finding that I can get either the diesel or a 6.0 gas engine for about the same price ~$15k. The diesel have higher mileage than the gas motors at that price range but otherwise the trucks are in similar condition. Also, and this is going back to me being cheap, I can find high mileage 6.0 trucks for a lot less than $15k. I can easily afford the trucks at $15k and even higher. I just don't like spending money, lol. Which engine should I go for? I've never owned a diesel. I know the LSx engines very well. Long term which would be the better buy? I'm worried that the diesel will cost me a lot to maintain or repair where as the 6.0 is cheap to rebuild and replace. Its also a hell of a lot easier to work on from what I can see. I'm just not sure I need the pulling power of the diesel though I like the fuel mileage better. Anyone else been faced with this dilemma or been down this road that can offer insight?

Thanks