The Wimberly WH-200 is the standard for gimbal mounts for large telephoto lenses. It is also expensive when purchased new. The used WH-200 I purchased from the National Camera Exchange eBay store is in great condition and cost just a bit more than half of what a new WH-200 costs. As an added bonus it has a Lenscoat camo cover. I am pleased with my purchase.
This is well designed and manufactured tripod head. Moves very-very smooth, holds weight of a camera and a lens without any vibration. Will give you piece of mind that attached gear is safe. Highly recommend.
This is the best gimbal head we have used and this is the second one for our tripods. Operates smoothly and is very reliable. It is not the lightest gimbal available but extremely well constructed.