imported post
Yes, I run 3 ft x 5 ft flags on 6 ft conduit pipe in them. I also have the same style holders on the back of my trailer so at times I can run 4 large flags for parades or PGR missions. The holder tubes are made of 3/4 inch conduit pipe.
My brother welded a 2 inch square tube to the bottom of the flat plate hitch as a 2" receiver so it's totally removable if need be.
Here's the other accessory he made for me to fit the receiver, a cooler rack that holds a 54 qt Colman cooler. The rack removes from the bar so it can also be used on the tongue of the trailer I tow for camping gear.
Flag poles in mounts on trailer.