I was using a Bogen 3021 + 3025 head (I know, too light) with the Bender 4x5 and the 75/135/203 lenses, which generally worked well as long as the wind was moderate. The 75 kept the camera crunched up to where all the mass was centered over the head, and the 135 and 203 are small lenses in small shutters. This system failed when I was given a 12" Wollensak in #4 Betax. So, when I acquired recently a Burke and James tailboard 5x7/4x5, I upgraded the head to a 3047. My back will not be happy, but so far no signs of problems in stability either.