I really thought the diesel Colorado had a higher tow rating than that.
Keep in mind their are many kinds of trailers and a hard sided travel trailer is by far the most difficult to tow. A truck that may be well suited to tow a 5,000 pound boat may be a struggling handful with a 4,000 pound travel trailer.
The dry weight of a trailer doesn't include water, propane, or a battery. You then have to add all of your food and gear.
If your tow rating really is 5,000 and the trailer really is 4,000 pounds dry then I would say you have too much trailer for that truck.
