Working on a podium - client is requesting a set of retractable casters so with the step on a single lever they are pulled up into base, lowering it to rest on it's own pedestal. A second step on lever lowers the wheels, essentially lifting podium up for transport. Idea is to keep casters hidden at all times and have a single pedal to actuate all 4 in unison.
I know I've seen a framed system that does this, as well as my client, but having a tough time locating. All I'm finding are single wheels, in which all 4 must be individually triggered. Likely I'm just not using the right trigger words for web search, but words such as frame, system, set and unison are of no luck so far.
Any direction for resources would be greatly appreciated.

Jeff