As mentioned, the payload of your truck is the limiting factor. All passengers, cargo (coolers, firewood, chairs, etc), any accessories added after it was built, the wdh, and the tw all add toward the payload of a vehicle.
What is the yellow sticker in the drivers door jamb state for payload? Estimate the tw at 13% of the trailers gvwr. Plus the family weight, plus cargo weight, plus.....
Another thing to understand when the manufactures state a tow rating, it is a flat bed trailer with a slab of steel on it. Very little wind resistance unlike a high walled travel trailer. Some manufactures will state a max front square feet area for vehicles as well.
Good luck!!!