I have a 2015 Tundra TRD Pro with the factory rear sway bar that drops the Towing capacity to 9600lbs and I tow my 16' open car hauler with tandem 3500 axles with a 4,000lb car with no trailer brakes fine. It drops my gas mileage down to about 7-8mpg, but it pulls and stops fine. A lot has to do...