The Model 2100 is value priced for those needing a Laptop Desk while the vehicle is stationary but not recommended for those who want to leave their laptop mounted, while the vehicle is in motion. #10 self tapping screws secure the SINGLE brace foot to the transmission hump or flat floor between seats. The 5167ACD uses the Cable Dock® System, our field proven, mechanical lock down system for securing a notebook computer to the table. Desk heighth is adjustable from 16" to 21" standard and 20" to 24 1/2" with optional height extension rod. For those wanting to use their laptop while the Truck is in motion (i.e. GPS or Map program etc.) we highly recommend Unit Code 2300 ABOVE.