Enclosed trailer question

Looking to down size our trailer and truck. We currently have a 42ft. enclosed trailer and a 1-ton dually. We really want something enclosed to pull with a 1/2ton truck, we will need enough room for a golf cart and a car, probably put the golf cart in sideways. My question is what would be the biggest trailer you could safely pull with a 1/2 ton truck? I would like think you could pull a 28 ft. trailer using torsion bar hitch. Thanks for the help.