Dry weight really has little bearing here. How much do you think you will add to it? See, kind of hard to answer. So instead look at the trailers GVWR. You may not hit it, but better to err on the side of caution.
From its GVWR use 20% as its pin weight. My guess the fiver your looking at will have a 15-16000 GVWR and a pin weight around 3500 pounds. I doubt your going to find a SRW truck that will have 7000+RAWR, but your welcome to look. Also, I do not think you will find any gas truck today capable of towing 15K around.
