reelmedia Ronin rs2 is a good option however you will bottleneck it soon. Take the longer 60 cm kinemon cable offset the kinemon outside the weight of the camera. Use bpu batteries (gripbat 4s) and you can use a lens all the way up to 1.5-2kg.
Another option is the Zhiyun crane it can take a bigger payload and is easier to balance when having a front heavy build.
