Look at the owners manual. Find max tow rating. Get max combined vehicle gross rating. Realize this is the max limit with one person of 150 pounds and a tank of gas not a loaded truck with family of 4 seated.
Do you have tow package with cat 4 hitch, 7 pin connector and trailer brake controller? Before you start towing thousands of pounds make sure your truck is set up to tow. Weight distribution hitch or just ball on reciever?
Do you have lt tires or p rated tires? Are your shocks set up for towing or passenger comfort?
How heavy is the trailer you intend to tow? The tongue weight?? The advertised weight is empty as delivered to the dealer no battery nothing in the tanks.
I tow a 2013 hideout 27dbs behind an f150 with a 5.4 triton. If I fill the tanks I am at 90% of max tow rating. And it bouncess and and wiggles down the road. I usually don't put more than 10 gallons in the tanks. If it's empty I am comfortable at 65 mph or less.