I have an '05 Nissan Titan King Cab with the OEM towing package, rated to tow 9,500 lbs.
My Kubota Grand L3940, front end loader, & loaded tires weighs 6,156 lbs.
With a box blade or bush hog, chains & other stuff I carry I'm sure it's pushing 7,000 lbs.
That leaves about 2,500 for trailer...