Typically for a 1/2 ton truck I'd stay under 10,000lbs. Just looking at the numbers you posted the truck, when loaded to GVWR has 10,000lbs of weight rating room before you hit the GCWR.
Here's the kicker, you'l get real close to GVWR just with people and tongue weight. Typically a TT puts about 15% of trailer weight on the tongue. So, if you get a 10,000lbs trailer you can expect close to 1,500lbs of tongue weight......which according to your numbers exceeds the receiver rating. OUCH!!
So, how big of a trailer? Watch all those numbers and find a trailer that keeps you within those specs.
KJ
