You've got a good looking rig to start with.
There should be a sticker on the truck somewhere, usually in the doorjamb or glovebox with the weight rating for each axle. Then go to the truck stop and weigh each axle to see where you are at right now, and how much excess capacity you have left. As others have mentioned, I am sure you have more than enough capacity, my only concern would be balance since everything you will be adding will be behind the axles, and all the weight you add there will take weight OFF the front axle. In an extreme situation that could make the handling very poor. There are a few threads out there that tell you how to calculate all that with the weight you are adding and the distance from the axle centerline. A semi tractor is set up to handle a bunch of trailer weight on the fifth wheel, but it is all centered directly over the drive axles. Not saying what you are doing won't work, just might want to do some calculations on the weights. Also, that 80000# gvw is combined with the trailer, the gvw for the tractor alone would be the weight rating for each of the 3 axles added together.
Good luck! Dave
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