So if the U-haul trailer can carry that kind of weight and if all 4 wheels line up to fit on the trailer...and you have a sufficient tow vehicle....(no 4 cylinder compacts) ....I would say yes you can
I used U-Haul's trailer finder to find a trailer to tow behind our Ford Explorer and it came up with a message that read something like this: "do to the number of lawsuits we will not rent trailers to be towed with a Ford Explorer, but you can rent one of our trucks"... So I don't think U-Haul would be happy with you towing a tractor on a car hauler...IMO