DeWalt DWST1-71196 TStak Trolley with Folding Handle 3253561736148 | eBay
DeWalt DWST1-71196 TSTAK Trolley with telescopic handle
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 T-STAK Trolley & DWST1-70706 T-Stak IV Tool Storage Box with 2-Shallow Drawers : Amazon.co.uk: DIY & Tools