I recommend that you ignore your truck's stated towing capacity. It's rarely the determining factor when matching a trailer to a truck. Instead look at the sticker on your trucks driver side door frame and note the cargo capacity for your particular truck as configured by the manufacturer.
Then calculate 15% of the trailer's gross weight rating. To that number add the weights of all the passengers and any equipment you plan to load into the truck. Now compare the result to the truck's cargo capacity. As long as the load you calculated is less than the cargo capacity you are OK. I like to have 100 - 200 pounds left over because it's very likely you will end up carrying more stuff then you think.