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The best thing for you to do is load your truck as it'll be during your normal driving and go to your nearest DOT scale or truck stop and weigh your truck on axle at a time, and then combined. That'll give you an ACCURATE weight.
We have a 99 crew cab 7.3 dually, it weighs 7450 without the trailer. We put about 2500# tongue weight, Gooseneck trailer. We weighed the trailer and truck combo together. The front axle was about 4300# with the back at 5700#
Hope this helps
Like everyone has already mentioned the best way is to go weigh it yourself if you can. Mine is a 4x4 250 CC LB with the V-10 plus a full tank of gas and me came in at 6760. I imagine this is a bit late for ya though.