If you'll stop by the "Big 3" dealerships and pick up their towing guides so that you can see the towing capacities of the various configurations, you'll quickly see that a diesel has far more towing capacity than an equivalently-equipped gas engine.
You say you want a 3/4-ton DWR truck. I've never seen a dual rear wheel truck in a 3/4-ton...there is no such creature (at least as it comes off the assembly line). You'll need to move up to a 1-ton to get dual rear wheels.
And Rockintom is correct about getting a 1-ton DWR truck...you'll probably be very unhappy with a 3/4-ton truck since the pin weight of almost every Excel will put you over a 3/4-ton's GVWR and rear GAWR.
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2014 Winnebago Aspect 27K
2011 Kia Soul
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