I was hoping so. These threads always turn into a you need a CDL, log book, note from your mother, ect.
Just go get it with his trailer. Strap it down good and have a good time.
Also, make sure you have a way to load and unload on each end. I hauled my uncles 6' last summer but we each had a FEL at both ends so a lifting strap from the tail wheel mount to the top portion of the 3 point hitch. I have a boom pole for my FEL so it was a easy hookup but on my uncles end we had to first wrap a chain around the bucket to hook the strap too. It made the BH very close to the grill/radiator of his tractor. One other word of advise is to lift with the tractor stationary and back the trailer under it to load then on the other end drive the trailer out from under it. Its tricky to control the swing when driving the tractor and can lead to damage quickly.
Chris