Hi guys, I was thinking about building a flag mount for my hitch on my truck. I was looking on other forums to choose a design. I've chosen the design that I want but none of the forums stated anything about what material to use for the pole itself. Could I use like schedule 80 pvc or a piece of galvanized steel? What diameter? I want this to withstand at least 45 mph. Any suggestions are helpful. Thank you in advance.