I'm with Snowman; I've seen a lot of lies about that. I'd take the trailers GVWR as the weight you'll have, put 15% of that in the bed of the truck as the tongue weight, Add up the weights of all passengers, the weight of a full tank of fuel at 8 lbs per gallon, and make sure that all that "stuff" does not overload the truck all by itself. I think you'll find a lot of "1/2 ton towable" trailers break the bank at that point.