The dewalt toughsystem heavy duty trolley features a locking system to secure all the loaded tool boxes plus it can also be used to carry additional equipment and materials the 216mm heavy duty rubber wheels allow easy manoeuverability on rough terrain when carrying the tool boxes by hand they can also be fastened together allowing them to be carried together as a stack adjustable height foldable brackets allow tailored configuration and can carry up to 132lb59kg per pair there is also a foldab