Step 1: Go to Google Calendar and create a new event
Step 2: Set the title and time for your reservation
Step 3: Click add rooms. Search for and select the cart you want to reserve. Cart names and locations are here, for reference.
By default, Google will only search for available resources. If the laptop cart you want to use is already reserved, it will not show up as an available option.
Step 4: Save your reservation. You should see an event in your calendar with a laptop cart associated.