Truck don't weigh but 15800 with full tanks talked to the manufactor and trailer is rated at 80000 so it should handle
The trailer weighs at least 10,000 pounds. So that gives you a 26,000 empty weight, and 89,000 gross. You're going to have to load it perfect assuming you have a 12/40/40 capacity. How old is the trailer and what kind of shape is it in?