Johnny, as you can see this topic can be explosive. That doesn't make it a bad topic or question. We have all struggled with it and made a decision. So, I'll just speak factually. I have the same truck you do but an '02. I have an '08 2955. From actual weights, I am well under all of GMC's recommended weights. If I added 400 pounds of fuel, I would still be under the truck weights.
As you make your own decision, you might consider that you don't have to fill up that tank.
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