What does the door post say for payload? The pin weight of a 15000 fiver can be as high as 3000lbs when loaded. Your rear tires are probably rated for 73-7500lbs total. Besides, if you put 3000lbs on the rear axle, you headlights are going to be spotting owls in the trees.
Ditto X3 AND, While you can probably pull it, Your stopping power WILL be compromised AND, God forbid you get in a wreck, The Law will have a field day with you whether you caused it or not.....That is why I switched to an F-350 from an F-150
Paul
Got just the truck for you for sale , been pulling 23K DRV for a couple years.
Truck was 66K new will sell for 50k. 38k miles, like new condition
Private message me if interested