No doubt it towed just fine. It's an ideal trailer. Tongue weight is close to 20%. It is very long with the wheels set far back. There is very little frontal area, and it is aerodynamic to boot.
The tongue weight was within the payload capacity for your truck so no doubt the tires and suspension could hold it up. You had plenty of power for the weight, especially considering how little frontal area it had.
Really about your only concern was that receiver. Nobody here would know what the design limits of that receiver are, just the factory ratings. A few farmers threw caution to the wind and towed similar weights, and it worked out for them. At that point it's up to you. Glad it worked out.