This flag pole base is specially designed for use with our Giant Message Flags. Can be used as a substitute for standard Tire Base or Ground Spike when you want to install your Advertising Banner & Pole kit into the trailer hitch of a vehicle. Made of anodized aluminum, this adapter will not rust.

This fits a 2 inch receiver and the distance from the hitch pin to the flagpole insert is 17.5 inches.  The flagpole insert is designed for a flagpole with a 1-1/8 inch diameter.

Item for sale is a:  Trailer Hitch Flag Pole Holder

https://www.featherflags.com/product/Trailer-Hitch-Flagpole-Holder-4784-4-25240/