Our team has had the same cart for about 7 years now. It is a cart from Tractor supply that has 2 layers.
Depending on the size of the robot, and or drive team members, we have differnt sized legs for the table. Works out nice for working on the robot, and also fits the controls batteries and a first aid kit nicely.
The 2nd cart our team has used it this one. It worked great for years,
The bottom cart could be removed from the tool boxes for an easier cart to move with or left with them. Came in really handy when the team made it to the Semifinal, and finals. All the tools were always with us, and had a nice area in the middle for batteries.