Home Made Pylon

Hey all I wanted to share my project and get some opinions from some of you that might have more experience. I wanted an insanity pylon until I saw the price so for now I am going to go with a home made pylon that I've put together from 1-1/4 galvanized pipe and 1/2" eye bolts. The pipe is cut to 7-1/2 feet tall and I've put a cap on the top and drilled a hole to mount a trailer hitch ball. From everyone's experiences do you feel the cap and ball will be able to handle the forces from a wakeboarder? I also have an Eye bolt location for a tow point as well in case the ball doesn't work. I will post more pics once completed but I am an engineer so I worry about forces and moments on this thing as I have never used a pylon like this before. Take a look at the pic and let me know if you would trust the ball mounted to the cap.