Originally Posted by peterbilt201

made one of these for my girlfriend. very easy. she has a bed cover so i had to build her a hitch flag pole. works pretty good

How to Make a Homemade Truck Flagpole - YouTube

Originally Posted by HammerZ71

Use a receiver mount flag pole holder. See them all the time at college football games. Walmart I know has them, also seen them at Harbour Freight I think. In Athens, Ga. I've even seen them in quickies during football season.

Or for that matter make one. Weld a round pipe to a square pipe, drill hitch pin hole in square pipe, drill/tap a hole for a screw to hold flag pole in and tight. That's a 30 min job at most...