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Iíve been to East Africa 3 times for a total of about 50 days of shooting. The first time, I was new and ignorant of camera support. I saw that bean bags are about the only commonly used means of support used, and they do work.
But there is a better solution. The triangle support below, you can make for about $10. It is light enough to lift with one finger. It packs slim in a suitcase. And it is VASTLY better than a bean bag. A lens resting on a beanbag, can shift focus as it moves, since most Canon teles have full time manual focus. With the triangle, the lens foot is totally supported by the ball head, the lens barrel is not rolling around on the bag, and shifting the focus.
The legs are two inch steel bolts. If you press the triangle down on the vehicle roof with your left hand, and you shoot with your right hand, it is equivalent to a 200 pound tripod! The two legs are dropped inside the opening of the vehicle. Only the third leg actually rests on the vehicle steel roof. With the two legs pressed against the inside rim of the roof opening, the triangle cannot rotate in a plane parallel to the ground, so it is very stable.
I mention all of these details, because when I offered this support before on FM, several photographers shot it down, said it was no good, when they had never seen, and had never used it! I can assure you that every serious Africa shooter on my last two tours, wished they had my triangle to use. They could see it in action., and see how stable it was. I would also take a bean bag for backup, because there may be some surprise vehicle configuration where the triangle might have a problem.