I spotted this on the tool launch page for the DWST08017 Toughsystem to Tstak adapter - looks like it may play with the non Tstak organisers too... : r/Dewalt
DeWALT DWST1-71196 TStak Trolley - YouTube
DeWalt DWST1-81079 TSTAK DAB+ BT Radio XR Battery Charger & Collapsible Trolley | Powertool World
DWST1-71196 | DeWALT Plastic Folding Tool Case Trolley for use with DeWalt TStak Boxes | RS