My first flag pole was from harbor freight, what a nightmare. I had to wrestle with it to get it collapsed as the twist to release wouldn't release.... most times. I finally got fed up and found 2 close trees and made it much shorter to fit in the CG dumpster.
I now have a fiberglass 22' flag pole from poles and holders and love it. Sometimes i make it a section or two shorter. The flag pole costs $54.95 and their under tire mount is $24.95. Many other mounts available.
click
HERE