Welcome aboard. It is great that you are researching your tow vehicle limits so as to purchase a properly sized trailer. First off, it is common for the hitch to be rated higher than trucks tow rating. Second, NEVER, EVER use the trailer dry weight in any research. That is unless your plan to never put ANYTHING in the trailer and tow it completely empty. If you are like the rest of us, you'll load it up with everything you can think you will need at which point the unloaded weight is absolutely useless. To be honest, I cannot understand why the manufacturers even publish that useless number. ALWAYS use the GVWR so you won't be sorry later.
That said, here is a link to the Trailer Life 2003 Towing Guide.