As stated pin weigh. Your truck has two tires on the rear axle, most likely rated at just over 3,000 lbs each. You need to consider the weight of the 5th wheel hitch, do you have an aux fuel tank, any items likely to be hauled in the bed of the truck. All of this will need to be considered.
Pay attention to the Gross Weight of the rig, who tows a empty trailer. A 10,000 lb gross unit could yield 2,500 lbs of pin weight added to the other items.
I think 5ers are easier to hitch and do tow better than TTs. Backing is different but once you adjust they are more maneuverable. They are also great bug magnets. I just wiped the slate clean on mine so aspiring bug artist will have a clean canvas for our next trip.