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We used to own a 23', a vintage '75 so it was light...sold it last year. Now we own a newer 25', and have pulled them both with an '07 GMC 1/2 ton pickup....simular drive train to your Denali.
I can tell you the '75 23' was very easy to pull. We pulled it last summer to Alaska and back averaging 12.1 MPG. The '01 25' however, is a wide body, weighs about 1500 pounds more, and is all I want to pull with the 1/2 ton truck.
Hope this is of some help.
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