Hardware and stuff.

Not pictured...
Professional Wood Glue
(qty 1) 2x6x90 board
(qty 2) 2x4x90 board
Circular Saw
Electric Drill/Screwdriver
Rattle Can (Matte black)


 

Paint It Black

Cut the lumber

Assemble the base

Install verticals
Install angle braces (x4, next picture)
Install crossmember


 

Umm, a diagram.. I think...

Install the tie-downs

 

Tighten up the tie-downs

 

...

Install store-bought flag mounts

Another diagram, of sorts...

Load it up!

 

Design road tested at 30 mph.  No problems.

Design road tested at 70 mph into a 20 mph headwind... the store bought aluminum flag mounts sheared off at their internal connections.
Red Neck Flag Mount assembly suffered no damage or stress of any kind.

Currently looking for (3x) single piece vertical steel flag mounts...

_______________

Update...

Store bought aluminum flag mounts replaced with 2 big U-bolts per flag.  The flag poles themselves will break long before any other part of the structure.  Design road tested at sustained 70 mph for 3 miles.  No trouble whatsoever other than the flags started to fray at the ends.

Currently looking for metal flag poles...