My fiver is 12k loaded and I tow with 6.0 gasser with 4:10 axle. See truck in sig below. I also could not justify cost for oil burner in my case. I tow maybe 3000 miles per camping season and through moderate hills here in upstate NY. I have no complaints. If going GM gasser HD, make sure you get 4:10 axle to maximize the gasser abilities, especially if towing 9000 lbs or more.
Steve
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