Some teams have a pneumatic lift for their bot, but ours just went simple. The arms that we use to steer our cart can be swung all the way down, effectively turning the cart into a table. It does (in effect) the same thing as a pneumatic lift, but is much simpler.

One note for if/when you make your own is to make it out of aluminum, because hauling around a steel monster is not fun. Steel is much too heavy for the task.