I take a lot of photos out the window of my truck. Many of the birds that I see will fly away as soon as I exit my truck, so it is my mobile bird and wildlife blind. To allow me easy access to my camera(s) I made a couple of these. The clamp is from Amazon or you can find them at camera retailers.
https://c7.staticflickr.com/6/5503/3...6ec5d798_b.jpg
Cup Holder Tripod Mount by Harvey Richards, on Flickr
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Weapons of the Day by Harvey Richards, on Flickr