When looking at trailers, use the GVWR of the trailer not the empty weight. No one goes camping with an empty trailer and you would be amazed how much stuff get packed in over time. Even if you think you pack light, the propane, water, battery, etc...can quickly add 600-800lb.
Related to that, assume 15% of the GVWR as hitch weight (the listed hitch weight assumes an empty trailer). The hitch itself will have a weight rating but also the hitch weight counts against payload. Add in people and gear in the truck and hitch weight and check against payload...often you run out of payload before you run out of tow rating.
