Winter - watched a few hunt DVDs. One thing surprised me, seeing very solid tripod used for spotting scopes, on sheep hunts too (without horses support etc). For better stability, I guess? I thought a lighter weight tripod, maybe with that hook-suspended weight accessory, would be stable enough, but not always so apparently.
Most don't seem to carry these stocky things. I assume these tripods are the spendy, carbon fiber variety, but the carbon fiber tripods I looked up on Manfrotto's website were 7-8kg. Seems like a lot of weight; 15-18#. Good way to spend more time glassing maybe. I guess its the wind that makes something like that worthwhile? High power spotters maybe?