I towed my 9K lb 30 foot trailer with my 35 HP LS. I needed to spin it in tight quarters. I used the draw bar, but put the bar as far out as it would go to provide more clearance for a pivot of the trailer. When I was done the drawbar was the shape of a banana. Tongue weight on the trailer is about 800 lbs and I guess that was too much for the lever action of the fully extended drawbar. All this to say be careful with the drawbar if you have excessive tounge weight.
I picked up a three point receiver cheap on Craigs List for next time.