For heavy cameras, get a Dana. The Dana’s can be configured multiple ways - as dolly, sliders, etc. http://www.danadolly.com/
URSA Mini Pro 4.6K G2, Blackmagic Design Pocket Cinema Camera 6K, Panasonic GH5 PC Workstation Core I7 64Gb, 2 x AMD R9 390X 8Gb, Blackmagic Design DeckLink 4K Mini Monitor, Windows 10 Pro 64-bit, Resolve Studio 18, BM Micro Panel & Speed Editor