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 with Foldable Handle
DEWALT TSTAK Stackable Utility Cart Trolley and TSTAK VI 17 in. Stackable Deep Tool Storage Box DWST17888W17806 - The Home Depot
DEWALT TSTAK Storage Trolley - DWST1-71196 for sale online | eBay
Dewalt TSTAK Trolley DWST1-71196
Wózek transportowy do TSTAK DeWalt DWST1-71196
DeWalt DWST1-71196 TSTAK TROLLEY szállítókocsi
DEWALT DWST83411-1 TSTAK 2.0 Mobile Bundle Long Handle - ToolStore UK