spandila, 3185, nice rig. The only true way of knowing your weights, is to weigh everything. Weigh your truck with you, any passengers and a full tank of fuel. Get the front and rear axle weights. Then you need to have your rig packed as you would be for traveling and go get the whole works weighed, hitched up, and get the new axle weights for the truck and the weight of the trailer axles. Using your trucks specs, GVWR, RAWR, and fifth wheel tow limit, you will then be able to tell if you are ok.
Using the listed dry weight and estimating your add ons for the two of you, and not knowing what your truck weighs is just guess work.
Having said all of that, I have seen simillar trucks pulling bigger rigs and have seen bigger trucks pulling smaller rigs. Your truck will handle your new 3185 just fine, although you will most likely be overweight. But that remains unknown untill you load it and weigh it.
Enjoy yor new rig.
Peace
Dave