Systems, devices, and methods are provided relating to improved mounting platforms for supporting a payload on a movable object. In one aspect, an apparatus for supporting a payload comprises: a first support member coupled to the payload and configured to rotate the payload; a second support member coupled to the first support member and configured to rotate the first support member relative to the second support member; and a flexible member electrically coupling the first and second support members, wherein a length of the flexible member winds around a portion of the first support member or second support member, such that the length winds up around the portion when the first support member is rotated in a first direction and unwinds from the portion when the first support member is rotated in a second direction.