A design I came up with some time ago that has been working very well for me over the years and the ~100 or so I have sold so far. 3D printed with strength, durability, and the outdoor elements in mind.

Fits 2" hitch receivers. You can even use it with your truck tailgate down if you get a cheap hitch extender - Harbor Freight sells some that would work.

Carbon fiber masts, aluminum poles, painters poles, you name it, this can hold it if it is around 1.25-2.5" in diameter. Many customers have used it with the 2.25" Spiderbeam poles even and it does great.

Comes with hitch receiver and 4 custom made veclro straps. It will likely be black in color, depending on materials on hand.