The Ronin is designed for a weight of up to 2 kg. The total load of the Nikon with the lens is therefore rather borderline. I can balance my Fujifilm XT4 with 18-135 mm zoom lens (weight 1.2 kg) just at the rear stop of the mounting plate. In my opinion, however, it makes little sense to use a gimbal with a fixed telephoto lens. Lenses in the wide-angle or 80 mm range make more sense. These lenses are correspondingly shorter and lighter. If the combination with the 135 mm lens is still to be used, then I would leave out the 'elevation plate' included by Ronin when mounting the camera (if this is not already the case anyway) and buy another mounting plate with counterweights. Just google: Ronin quick release plate with counterweights. I don't have any experience with this, but from what I've read it should solve the problem.