I tow a travel trailer (funfinder 189FDS) that is essentially the same size and weight with a Nissan Frontier, which is very similar in size and capability to his Colorado. My trailer has a factory claimed weight of 3040 pounds and 350 tongue. Actual weight as loaded is 4000 with 580 tongue.
I've towed it just on the ball, and also with WD. No doubt it tows better ( more stable ) and is a better setup ( front axle is now loaded back to unladen weight ) with the BlueOx swaypro installed.
According to the Nissan manual, WD is not "required" unless the trailer is over 4500 or tongue over 600. Having said that, setting up the BlueOx for 100% FALR makes this combo tow very well indeed. Well over 30K miles of towing it so far.
