I've got a 3/4 ton crewcab diesel, and it's supposed to be good for towing 13,200 lbs.
Unfortunately, 3/4 ton trucks' weakness is not in the drive train but in weight carrying capability--Pin Weight.
I thought my truck would pull one of my favored fivers--like a Big Horn or a Montana. But dual rear wheel trucks are really required for such a trailer.
I've found fifth wheel model with a 11,000 dry weight and a 2,000 dry pin weight. That's about all I feel comfortable towing.
My truck's long since paid for, and I just don't care to drive dual wheel trucks around our community.