Darren,
I used to use a short piece of EMT (Electrical conduit) for mine. Worked fine. However, if, after you hitch to your TV ball, you jack your camper tongue jack back up, lifting the TV at the same time, you will find you don't even need the pipe. I have been doing mine by hand for 3+ years. Some searching here on the forum will result in many posts about this.
John