I bought the 393 gimbal head from a third party, but I will share my experience with Amazon users.
This is a low cost equivalent of some very expensive other makes. At the same time it works well. The picture and description shows this as a monopod head, technically this is daft. I use it on a tripod (Manfrotto 475B also on Amazon). I use it with a 700mm lens and a heavy dSLR for wildlife photography. Once this combination of camera and lens are mounted in the gimbal head, they can be moved with one finger. It is not necessary to tighten up the movements (as with a ball head); if I aim the camera in any direction it stays there without moving. I can do some panning for moving subjects.
The picture shows the support bracket above with camera hanging from it. It works just as well with the support bracket in the low position, supporting the camera. It is also much easier to set up a heavy lens and camera in this position.
The gimbal head is unsuitable for trekking because it is used heavy photo kit and a sturdy tripod. Go there by car rather than public transport.