114 inches from the top of the ball to the ground.. 9.5 to 10ft should be about right.. keep in mind i have the chubby tower not sure what your running or if it matters, and also trailer height, tire height etc...
im not sure about plenty but you will have room.. (according to my calculations). i had mine made at 12 just incase i ever got something a little taller.. im sure it will work but never hurts to get a second opinion.....