Hello Richard,
I think I have an idea for you...A company called Deflecto makes several kinds and styles of plexiglas literature holders. You could get one of these in the form you need, perhaps mount it on a tripod or other device to elevate it, AWAY from the car, and they will hold your brochures. Some of them will even allow you to have an information sheet that can be read in addition to holding those that can be taken, allowing you to give people information without everyone taking a brochure. You could also visit a Michael's (arts and crafts store chain) and they have these pre-fab science fair kits,
http://www.hunt-corp.com/office/showtime/officeframe.html which would allow you to have a montage about the Pagoda's and you could add one of the literature display devices, and simply anchor it to the ground away from the car. I think when you see these things your creative juices will begin to flow, and you can devise the best thing to work for you.
http://www.deflecto.com then click on literature holders and or deluxe literature holders. Many of their products can be purchased on line from varioud office supply stores. I hope this helps.
BTW can you email me or post the contents of your brochure? I'd like to see it.
Michael Salemi
1969 280SL
Signal Red w/Black Leather
Restored