The OP did specify Berlebach. I use a 4032 with a Gitzo R-4 head with my 810M. This is a very solid combination and is stable even fully extended. And fully extended, I need to use a step stool to focus on the ground glass. I'm 6'4". I flirted briefly with a ball head because I like my 2032/Photoclam Gold combination quite a bit for 4x5. The 810M doesn't' play nice with ball heads, however. In order to turn the head into a quick release, I added a Cambo QR adapter with a 3/8" plate. It works great.
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